Abstract
Calcifying aponeurotic fibroma (CAF) is a rare soft tissue tumor which falls under the WHO category of benign fibroblastic and myofibroblastic tumors. It typically occurs on the distal extremities (hands and foot) of children and adolescents. Other less common sites include wrists, ankles, trunk and rarely legs and arms. These tumors present as a painless soft tissue mass, arising in the subcutis, and are usually connected to tendons or aponeuroses. Computed tomography (CT) and magnetic resonance imaging (MRI) are the radiological investigations of choice; however, histopathology remains the diagnostic modality of choice for the diagnosis of CAF. We present a rare case of a 17-year-old boy who presented with a gradually progressive mass lesion on the leg which was later diagnosed as calcifying aponeurotic fibroma on histopathology.
Keywords: Juvenile aponeurotic fibroma, Benign neoplasm, Leg, Young adolescent tumor
Introduction
Calcifying aponeurotic fibroma (CAF) is a very rare soft tissue tumor [1]. It was described by Keasbey in 1953 for the very first time [2].The term was coined by Iwasaki and Enjoji in 1973 [3]. More than 150 cases have been reported in the literature till now [5]. It is mostly seen in children and adolescents predominantly in the first and second decade of life, with peak incidence between 8 and 14 years of age, therefore, also known as juvenile aponeurotic fibroma [1, 4]. However, occasionally, it can also be seen in older individuals [1]. Males have a slightly increased tendency for this tumor with male to female ratio of 2:1 [1, 5]. This tumor most commonly occurs in the distal extremities [1]. A total of 80% of the tumors occur in hands (palm) and feet (plantar aspect) while the rest of the 20% tumors occurs in the proximal extremities or trunk [1]. The rare sites are legs, arms and the lumbosacral region [1]. Local recurrences are common in this tumor due to its infiltrative nature; therefore, though benign in nature, it is important to identify and diagnose this tumor and a long-term follow-up is required [4, 5].
We present a rare case of a 17-year-old boy who presented with a slow growing mass on the leg.
Case Report
A 17-year-old male presented with a mass on the right leg present from the last 9–10 months. He gave the history that it was slowly growing in size from the last 3–4 months and has also become tender from the last 1 month. The magnetic resonance imaging (MRI) findings were a well-defined lobulated altered signal intensity lesion in subfascial planes along the medial border of the soleus muscle with minimal extension into overlying subcutaneous soft tissue—likely slow flow vascular malformation. The clinicians made a provisional diagnosis of venous hemangioma based on the clinical and radiological features. However, computed tomography (CT) was not performed for the lesion. The swelling was excised completely and sent for histopathological examination. On gross examination, it was a grey brown circumscribed lobulated soft tissue mass measuring 3.5 × 2.5 × 2 cm. While cutting, there was a gritty sensation. The cut section showed a nodule measuring 2 × 1.7 × 1.2 cm (Fig. 1A). The nodule had few hard calcified areas. The surrounding area was fibrofatty. The sections were taken and processed. On microscopic examination, an infiltrating tumor was identified comprising of spindle cells arranged in fascicular pattern (Fig. 1B, C). The individual cells were exhibiting oval to spindle shape nuclei with bland chromatin, inconspicuous nucleoli and moderate amount of cytoplasm with indistinct cell boundaries (Fig. 1D). The tumor was infiltrating into the adjacent fat focally (Fig. 1F). There were numerous areas showing marked calcification (Fig. 1E). Few congested blood vessels were also noted in the lesion. However, no atypia/chondroid differentiation/increased mitosis was seen in the sections examined.
Fig. 1.
A Gross picture of the excised mass from the leg of the patient showing a greyish white ill-defined mass infiltrating into the adjacent soft tissue. Note the small white flecks indicating calcified areas. B, C Low power view shows spindle cells arranged in fascicular pattern along with areas of calcification (H&E, × 40 and × 100, respectively); D high power view showing cells exhibiting oval to spindle shape nuclei with bland chromatin and moderate amount of cytoplasm (H&E, × 400); E low power view showing areas of calcification within the lesion (H&E, × 40); F low power view showing the infiltration of spindle cells into the adjacent adipose tissue (H&E, × 40)
Review of Literature (Table 1)
Table 1.
List of cases diagnosed with calcifying aponeurotic fibroma
| S. no | Author name | Year of publish | Site | Age | Gender | Additional findings (clinical features and recurrence of lesion) |
|---|---|---|---|---|---|---|
| 1 | Sanmiguel et al. [3] | 2022 | Left clavicular region | 64 year | Female | Swelling of left clavicular region from 3 years |
| 2 | Chalatsis et al. [7] | 2022 | Plantar aspect of right foot | 5 year | Female | |
| 3 | Won et al. [8] | 2021 | Posterior tibial tendon | 74 year | Female | Progressive pain in the medial foot from 3 years |
| 4 | Lee et al. [9] | 2021 | Wrist | 59 year | Female | Mild swelling and discomfort in her left wrist |
| 5 | Gallagher et al. [10] | 2021 | Finger | 15 year | Female | Painless progressively enlarging |
| 6 | Sadiq et al. [11] | 2021 | Tendon of Achilles | |||
| 7–14 | Kang et al. [12] | 2020 (8 patients) | Foot (5), hand, ankle and knee | |||
| 15 | Hamoud et al. [4] | 2020 | Tendon of Achilles | 4 year | Female | |
| 16 | Zhang et al. [13] | 2020 | Distal right thigh | 8 year | ||
| 17 | Navas et al. [14] | 2019 | Sole of right foot | 84 year | Male | Firm, immobile, non-tender mass |
| 18 | Ozcanli et al. [15] | 2019 | ||||
| 19 | Motta et al. [16] | 2018 | Dorsum of foot | 5 year | Male | |
| 20 | Lee et al. [17] | 2018 | Carpal joints | 59 year | Female | |
| 21 | Chaltsev et al. [18] | 2018 | Generalized over the whole body | 52 year | Male | Taking medication for rheumatoid arthritis and nodules |
| 22 | Sheikh et al. [19] | 2018 | Medial aspect of distal hallux | 25 year | Female | |
| 23 | Romano et al. [20] | 2017 | 3rd finger of left hand | 71 year | Male | Two soft tissue swelling on same finger, one was CAF and other was Masson tumor |
| 24.-27 | Corominas et al. [21] | 2017 (4 cases) | all children | |||
| 28 | Sekiguchi et al. [22] | 2017 | Right ankle | 17 months | Female | |
| 29 | Lee et al. [23] | 2017 | Knee | 19 year | Male | |
| 30 | Shim et al. [24] | 2016 | Left upper arm | 23 year | Female | |
| 31 | Khullar et al. [25] | 2016 | Mid plantar aspect of left foot | 22 year | Male | Firm tender nodule on mid plantar aspect of left foot |
| 32 | Cho et al. [26] | 2015 | Dorsum of left foot | 4 year | Male | |
| 33 | Kim et al. [5] | 2014 | Dorsal wrist | 67 year | Male | |
| 34 | Nishio et al. [27] | 2014 | Right little finger | 69 year | Female | |
| 35 | Schonauer et al. [28] | 2013 | Tip of index finger of right hand | 44 year | Male | Progressive tender swelling from 2 years |
| 36 | Thakur et al. [29] | 2011 | Forehead | 24 year | Female | Swelling forehead from 6 months |
| 37 | Takaku et al. [30] | 2011 | Elbow | 10 year | Female | Slowly growing mass since 5 years |
| 38 | Giuffre et al. [31] | 2011 | Distal and proximal phalanges of right thumb | 44 year | Male | Recurrent swelling with invasion into the distal and proximal phalanges, the skin, the radial and ulnar neurovascular bundles and the tendons, treated with amputation thumb |
| 39 | Kramer et al. [32] | 2010 | Left ascending ramus | 62 year | Female | Slowly progressive |
| 40 | Arora et al. [33] | 2010 | Gluteus maximus | 2 year | ||
| 41 | DeComas et al. [34] | 2009 | elbow | Infantile fibrosarcoma 12 years back on the same site | ||
| 42 | Yura et al. [35] | 2008 | Medial pterygoid muscle | 60 year | Female | Asymptomatic round radio-opaque lesion in the right mandible |
| 43 | Choi et al. [36] | 2008 | Finger of hand | 36 year | Female | Finger with distal phalangeal bone involvement |
| 44 | Oruc et al. [37] | 2007 | scalp | 3 year | Male | |
| 45 | Kim et al. [38] | 2006 | wrist | 38 year | Female | Painful swelling |
| 46 | Parker et al. [39] | 2006 | Left hand | 11 year | Male | Slow growing mass in the palm of left hand |
| 47 | Hasegawa et al. [40] | 2006 | knee | 2 months | Male | Swelling on right knee |
| 48 | Kwak et al. [41] | 2004 | thigh | 4 year | Male | |
| 49 | Sethi et al. [42] | 2003 | ||||
| 50 | Choi et al. [1] | 2003 | Thumb | 14 year | Male | Non painful mass at the ulnar aspect of thumb |
| 51 | Amaravati et al. [43] | 2002 | Hand | |||
| 52 | Sferopoulos et al. [44] | 2001 | Palmaris longus tendon | 8 year | Male | |
| 53 | Sferopoulos et al. [44] | 2001 | Lateral aspect of the foot at the base of fifth metatarsal | 43 year | Female | |
| 54 | Sferopoulos et al. [44] | 2001 | Fifth digit of the foot | 48 year | Male | |
| 55 | Tai et al. [45] | 2001 | Hand | 9 year | Male | |
| 56 | Desimone et al. [46] | 2001 | Hand | |||
| 57 | Lim et al. [47] | 2001 | 2nd digit of right hand | 24 year | Female | |
| 58–79 | Fetsch et al. [48] | 1998 (22 cases) |
Back, 8 Knee, 5 Thigh, 3 Forearm, 3 Elbow, 2 Arm, 1 |
2–43 years |
15 male 7 females |
Painless mass |
| 80 | Sharma et al. [49] | 1998 | Neck | 5 year | Female | |
| 81 | Murphy et al. [50] | 1996 | Subcutis of lumbosacral region | 26 year | Male | Recurrent at the age of 3, 10, 18, 26 |
| 82–84 | Lu et al. [51] | 1995 (3 cases) | Hand or foot | 8–27 years | Female | |
| 85 | Hassel et al. [52] | 1992 | Left forefinger | 20 year | Male | 3 subcutaneous tumors |
| 86 | Kang et al. [53] | 1992 | Right sole | 11 year old | ||
| 87 | Yee et al. [54] | 1991 | Digits of foot | |||
| 88 | Rangwala et al. [55] | 1988 | ||||
| 89 | Lafferty et al. [56] | 1986 | Palm | 3.5 year | Female | Metastatic fibrosarcoma to lungs and bones 5 years later of CAF excision |
| 91 | Eisenbaum et al. [57] | 1985 (2 cases) |
First web space of right hand Between index and long finger of right hand |
11 year 28 year |
Male Female |
|
| 92 | Aprin et al. [58] | 1984 | Knee joint | 14 year | Male | |
| 93 | Allen et al. [59] | 1970 | Left wrist | 11 year | Male | Two local excision within 12 years |
| 94 | Allen et al. [59] | 1970 | Middle finger right hand | 8 year | Male | Two local excision within 11 years |
| 95 | Allen et al. [59] | 1970 | Plantar surface, right foot | 13 year | Male | Local excision. Asymptomatic post operation |
| 96 | Allen et al. [59] | 1970 | Palmar aspect, base of right index finger | 17 year | Male | Local excision. Asymptomatic post operation |
| 97 | Allen et al. [59] | 1970 | Palm left hand | 3 year | Male | Two local excision within 7 years |
| 98 | Allen et al. [59] | 1970 | Right hypothenar eminence | 15 year | Male | Local excision. Asymptomatic post operation |
| 99 | Allen et al. [59] | 1970 | Palm of hand | 1 year | Male | Two local excision within 6 years |
| 100 | Allen et al. [59] | 1970 | Palm left hand, | 11 year | Male | Local excision. Asymptomatic post operation |
| 101 | Allen [59] | 1970 | Palmar aspect right hand | 8 year | Male | Two local excision within 4 years |
| 102 | Allen et al. [59] | 1970 | Anatomical snuff box, around extensor tendons | 10 year | Male | Two local excision within 4 years |
| 103 | Allen et al. [59] | 1970 | Left palm | 19 year | Male | Local excision. Asymptomatic post operation |
| 104 | Allen et al. [59] | 1970 | Left index finger | 5 year | Male | Two local excision within 3 years |
| 105 | Allen et al. [59] | 1970 | Right index finger | 18 year | Male | Two local excision within 2 years |
| 106 | Allen et al. [59] | 1970 | Posterior thigh | 5 year | Male | Local excision. Asymptomatic post operation |
| 107 | Allen et al. [59] | 1970 | Right forearm | 2 year | Male | Recurred twice within 2 years of first local excision |
| 108 | Allen et al. [59] | 1970 | Popliteal fossa | 12 year | Male | Recurred within 2 years of first local excision |
| 109 | Allen et al. [59] | 1970 | Left hand | 9 year | Male | Local excision. Asymptomatic post operation |
| 110 | Allen et al. [59] | 1970 | Right wrist | 8 year | Male | Local excision. Asymptomatic post operation |
| 111 | Allen et al. [59] | 1970 | Hand | 2 year | Female | Local excision. Asymptomatic post operation |
| 112 | Allen et al. [59] | 1970 | Left palm | 10 year | Female | |
| 113 | Allen et al. [59] | 1970 | Right middle finger | 12 year | Male | |
| 114 | Allen et al. [59] | 1970 | Left knee | 15 year | Male | |
| 115 | Allen et al. [59] | 1970 | Palm of right hand | 6 months | Female | |
| 116 | Allen et al. [59] | 1970 | Left finger | 19 year | Male | |
| 117 | Allen et al. [59] | 1970 | Right foot | 21 year | Female | |
| 118 | Goldman et al. [60] | 1970 | Wrist | 14 year | Female | Two local excision were done within 5 years |
| 119 | Goldman et al. [60] | 1970 | Palm | 5 year | Male | Local excision. Asymptomatic post operation |
| 120 | Goldman et al. [60] | 1970 | Hypothenar | 4 year | Female | Two local excision were done within 6 months |
| 121 | Goldman et al. [60] | 1970 | Ankle | 34 year | Male | Local excision. Asymptomatic post operation |
| 122 | Goldman et al. [60] | 1970 | Abdominal wall | 27 year | Male | Local excision. Asymptomatic post operation |
| 123 | Goldman et al. [60] | 1970 | Neck | 6 year | Male | Local excision. Asymptomatic post operation |
| 124 | Goldman et al. [60] | 1970 | Wrist | 64 year | Male | Local excision. Asymptomatic post operation |
| 125 | Brown et al. [60] | 1969 | Wrist | 1.5 year | Male | Local excision. Asymptomatic post operation |
| 126 | Shapiro et al. [60] | 1969 | Shoulder | 11 year | Female | Local excision. Asymptomatic post operation |
| 127 | Kermarec et al. [60] | 1968 | Popliteal space | 1.5 year | Male | Two local excision were done within 2 years |
| 128 | Bartok et al. [60] | 1967 | Palm | 15 year | Male | Local excision. Asymptomatic post operation |
| 129 | Rios Dalenz et al. [60] | 1965 | Lumbar paravertebral | 15 year | Male | Local excision. lost to follow up |
| 130 | Lichtenstein et al. [60] | 1964 | Metacarpal | 10 year | Male | Two local excision within 7.5 years |
| 131 | Lichtenstein et al. [60] | 1964 | Forearm | 35–40 years | Male | Local excision. Lost to follow up |
| 132 | Lichtenstein et al. [60] | 1964 | Finger | 35 year | Female | Local excision. Asymptomatic post operation |
| 133 | Lichtenstein et al. [60] | 1964 | Finger | 32 year | Male | Recurrent nodule 11 months after first local excision |
| 134 | Lichtenstein et al. [60] | 1964 | Lower leg | 52 year | Male | Local excision. Lost to follow up |
| 135 | Keasbey et al. [60] | 1961 | Plantar fascia | 8 year | Male | Local excision. Asymptomatic 2 years post operation |
| 136 | Keasbey et al. [60] | 1961 | Hypothenar space | 6 year | Male | Local excision. Asymptomatic 4 years post operation |
| 137 | Keasbey et al. [60] | 1961 | Metacarpal | 3 year | Female | Local excision. Asymptomatic 9 years post operation |
| 138 | Keasbey et al. [60] | 1961 | Lumbar paravertebral | 6 year | Male | Local excision. Asymptomatic 7 years post operation |
| 139 | Keasbey et al. [60] | 1961 | Lower leg | 12 year | Female | Local excision. Lost to follow up |
| 140 | Keasbey et al. [60] | 1961 | Upper arm | 2 year | Male | Local excision |
| 141 | Keasbey et al. [60] | 1961 | Forearm | 3 year | Female | Two local excision in 2.5 years |
| 142 | Keasbey et al. [60] | 1961 | Ankle and dorsal foot | 18 year | Female | Local excision. Asymptomatic 2.5 years post operation |
| 143 | Booher et al. [60] | 1959 | Wrist | 2 months | Female | Five local excision in 5 years |
| 144 | Booher et al. [60] | 1959 | Palm | 6 months | Male | Two excision in 14 months |
| 145 | Stout et al. [60] | 1954 | Palm | 10 year | Male | Local excision. Asymptomatic post operation |
| 146 | Stout et al. [60] | 1954 | Thenar space | 8 year | Male | Local excision. Asymptomatic post operation |
| 147 | Keasbey et al. [2] | 1953 | Mid line on the sole of foot | 9 year | Female | Four local excision in 3 years |
| 148 | Keasbey et al. [2] | 1953 | Thenar area | 7 year | Female | Three local excision in 2 years |
| 149 | Keasbey et al. [2] | 1953 | Hypothenar area | 6 year | Female | Three local excision in 16 months |
| 150 | Keasbey et al. [2] | 1953 | Thenar space | 2.5 year | Male | Two local excision in 1 year |
Three databases, namely PubMed/MEDLINE, Embase and Scopus, were systematically searched for case reports and case series published in English from the year 1953 to 2021. A total of 150 case reports have been published till now to the best of our knowledge and are included in the review in this study [1–60].
Of the 150 cases, there were 79 males and 48 females (Table 1). Gender was unknown in 23 cases. Male to female ratio was 1.4:1 representing a male predominance.
The age ranged widely ranging from 2 months to 84 years. The age group wise distribution of cases is as follows: 1–10 years—48 cases, 11–20 years—25 cases, 21–30 years—9 cases, 31–40 years—6 cases, 41–50 years—4 cases, 51–60 years—5 cases, 61–70 years—5 cases, 71–80 years—2 cases, 81–90 years—1 case and unknown age group—45 cases. Majority of the patients (73 cases) were < 20 years of age.
On the basis of site, most commonly involved were hands and foot (51 and 20 cases respectively) followed by arm (14 cases), trunk (13 cases), wrist and knee (10 cases each), thigh (9 cases), head and neck (7 cases), ankle (5 cases) and leg (3 cases). Site was not mentioned in 7 cases. Of the data available, few of the patients (n 24) showed recurrence of swelling at the same site multiple times. Only one case is reported till now in which metastatic spread of malignant fibrosarcoma to lungs and bone was seen, 5 years after the excision of CAF. Our case in the current study represents a rare case of CAF present on leg which was misdiagnosed as hemangioma.
Discussion
Calcified aponeurotic fibroma is a rare, benign fibroblastic soft tissue neoplasm which commonly arises from deep volar fascia, aponeurosis of hands or tendons [4, 6]. The etiopathogenesis of calcified aponeurotic fibroma is still unclear. It presents as a solitary, slow-progressing, non-tender mass. Rarely, it can present as multiple discrete masses. Radiological findings include soft tissue mass with foci of fine or coarse calcifications. Computed tomography (CT) is the modality of choice for visualization of calcification while magnetic resonance imaging (MRI) is useful to know the extent of the lesion pre-operatively [4]. MRI features of CAF are poorly defined subcutaneous mass and low to intermediate intensity on T1 weighed images due to fibrous component and calcification. The intensity varies on T2 weighed images [3]. However, the radiological findings can sometimes be non-specific. A definite diagnosis of the lesion can be made on histopathology [4]. Macroscopically, the tumor may range from 1 to 5 cm in diameter [6]. Histopathologically, calcified aponeurotic fibroma is characterized by proliferation of fibroblastic cells in a diffuse or nodular pattern along with foci of calcification and chondroid areas and absence of mitosis [1, 6]. Osteoclast-like giant cells may also be seen in varying proportion [6]. The lesion may also infiltrate the surrounding adipose tissue. Some lesions may also show fibromatosis-like areas. The tumor has a biphasic development comprising of initial and late phase. In the initial phase, the tumor lacks calcification and has more infiltrative growth while in the late phase, it is nodular and calcified and chondroid lesions are more common, therefore, indicating that cartilaginous component increases with the evolution of disease [1, 5]. The current entity should be differentiated with other soft tissue neoplasms like infantile fibromatosis, plantar fibromatosis, fibrous hamartoma of infancy, fibroma and monophasic synovial sarcoma [1, 4] (Table 2). On immunohistochemistry, calcified aponeurotic fibroma shows positivity for CD99, CD68, vimentin and S100 protein [6]. The fibroblasts show positivity for SMA and are negative for beta catenin [6]. The FN1-EGF fusion appears to be the main driver of mutation in CAF [3]. It has not been observed in any other neoplasm, so appears to be a characteristic of CAF [3]. The treatment is complete surgical excision and close follow-up as it has a high tendency to recur [1, 4]. The recurrence rate has been found to be approximately 50% [5]. The local recurrence is more common in children < 5 years old [7]. Rarely, malignant transformation of the lesion has also been reported [7, 56].
Table 2.
Differential diagnosis of calcifying aponeurotic fibroma on histopathology
| Entity– > | Calcifying aponeurotic fibroma | Fibrous hamartoma of infancy | Infantile fibromatosis/lipofibromatosis | Palmar and plantar fibromatoses | Monophasic fibrous type synovial sarcoma |
|---|---|---|---|---|---|
| Age | 2 years–adults | Birth–2 years | Birth–8 years | Adults (60 years) | 6–82 years |
| Sex | M > F | M > F | M > F | M > F | M > F |
| Site | Distal extremities (hands and feet), trunk, ankles, arms, legs | Axillary folds, upper arm, thigh, inguinal and pubic region, etc | Extremities, trunk, head and neck | Palms and plantar aspect of foot | Extremities–knee region being the most common |
| Regression | May be present in early stages | Not identified | Not identified | Not identified | Not identified |
| Recurrence | Present (50% cases) | Present (16% cases) | Present | Present (rates vary significantly) | Present |
| Clinical features | Solitary, poorly circumscribed firm slowly progressing mass | Small rapidly growing mobile mass in subcutis or reticular dermis | Solitary, poorly circumscribed firm rapidly growing mass | Solitary slow growing firm nodule | Palpable deep-seated tender swelling |
| Microscopic findings | Proliferation of fibroblastic cells in a diffuse or nodular pattern and absence of mitosis | Organoid pattern comprised of interlacing fibrous tissue, islands of loosely arranged spindle shaped cells and mature adipose tissue | Proliferation of primitive mesenchymal cells and fibroblasts in a myxoid background and residual muscle fibres and fat | Fascicles of slender fibroblasts separated by variable amount of collagen. Multinucleated giant cells are present. Mitotic figures may be identified | Proliferation of spindle cells (sarcomatous component) or rarely epithelial glandular component |
| Calcification and chondroid differentiation | Present | Absent | Absent | Absent | Present |
Author Contribution
Dr. AJ took part in evaluation of the case and manuscript drafting. Dr. GK was involved in final evaluation of the case, manuscript drafting and editing and revision. Dr. RS was involved in the management of the patient. Dr. MKR was involved in the final evaluation of the case.
Funding
None.
Data Availability
The data that support the findings of this study are available on request from the corresponding author. The data are not publicly available due to privacy or ethical restrictions.
Declarations
Conflict of Interest
The authors declare no competing interests.
Footnotes
Publisher's Note
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
References
- 1.Choi JH, Seo JS, Cho KH. Calcifying aponeurotic fibroma: a case report. Yeungnam Univ J Med. 2003;20(2):223–228. doi: 10.12701/yujm.2003.20.2.223. [DOI] [Google Scholar]
- 2.Keasbey LE. Juvenile aponeurotic fibroma (calcifying fibroma); a distinctive tumor arising in the palms and soles of young children. Cancer. 1953;6(2):338–46. doi: 10.1002/1097-0142(195303)6:2<338::AID-CNCR2820060218>3.0.CO;2-M. [DOI] [PubMed] [Google Scholar]
- 3.Sanmiguel J, Diaz PS, Marsico S, Trull JL, López AS. Calcifying aponeurotic fibroma: a multimodal imaging description of an unusual case involving soft tissues adjacent to the clavicle. Radiol Case Rep. 2022;17(5):1424–1430. doi: 10.1016/j.radcr.2022.02.001. [DOI] [PMC free article] [PubMed] [Google Scholar]
- 4.MusabHamoud A, Yasser Nasser A, Najd AA. Calcifying aponeurotic fibroma around Achilles tendon: a case report. Radiol Case Rep. 2020;15(6):753–756. doi: 10.1016/j.radcr.2020.03.015. [DOI] [PMC free article] [PubMed] [Google Scholar]
- 5.Kim OH, Kim YM. Calcifying aponeurotic fibroma: case report with radiographic and MR features. Korean J Radiol. 2014;15(1):134–9. doi: 10.3348/kjr.2014.15.1.134. [DOI] [PMC free article] [PubMed] [Google Scholar]
- 6.Bajaj A. The concrete paltriness-calcifying fibrous tumour. Clin Surg. 2020;3(5):1–4. [Google Scholar]
- 7.Chalatsis GP, Mitrousias V, Siouras A, Aggelis F, Rigopoulos N, Papachristou DJ, Malizos KN. Calcifying aponeurotic fibroma at the sole of the foot in a 5 year old girl. A case report with 5 years follow up. Foot Ankle Surg: Tech Rep Cases. 2022;2(2):100180. [Google Scholar]
- 8.Won SH, Kim J, Cho J, Chun DI, Kim K, Yi Y. Calcifying aponeurotic fibroma around posterior tibialis tendon in an elderly patient with flatfoot: a case report. Medicine. 2021;100(30):e26803. doi: 10.1097/MD.0000000000026803. [DOI] [PMC free article] [PubMed] [Google Scholar]
- 9.Lee JK, Kwon YW, Shim JC, Kang YK, Cho WM, Park JW, Han SH. Similar appearance of different multifocal carpal bone destructing disease entities in 3 patients: a case report. Medicine. 2021;100(28):e26445. doi: 10.1097/MD.0000000000026445. [DOI] [PMC free article] [PubMed] [Google Scholar]
- 10.Gallagher M, Cooper L, Ibanez MJ. Recurrent calcifying aponeurotic fibroma of the hand: managing a rare hand tumour in an evolving healthcare landscape. BMJ Case Rep. 2021;14(1):e238418. doi: 10.1136/bcr-2020-238418. [DOI] [PMC free article] [PubMed] [Google Scholar]
- 11.Sadiq M, Nayeemuddin M, Hussain MW. A case of large calcifying fibroma of tendo-achilles managed by en-block resection and tendon reconstruction. J Foot Ankle Surg. 2021;60(1):167–171. doi: 10.1053/j.jfas.2020.05.018. [DOI] [PubMed] [Google Scholar]
- 12.Kang JH, Lee K, Yoo HJ, Chae HD, Hong SH, Choi JY. Ultrasound and magnetic resonance imaging features of calcifying aponeurotic fibromas. J Ultrasound Med. 2020;39(7):1299–1306. doi: 10.1002/jum.15222. [DOI] [PubMed] [Google Scholar]
- 13.Zhang L, Kobayashi H, Ikegami M, Ohki T, Shinoda Y, Tanaka S, Kawano H. Calcifying aponeurotic fibroma of the thigh: a differential diagnosis for infant knee contracture and leg length inequality (a case report) Int J Surg Case Rep. 2020;69:96–100. doi: 10.1016/j.ijscr.2020.03.039. [DOI] [PMC free article] [PubMed] [Google Scholar]
- 14.Garcia Navas FM, Fernandez N, Lopez A, Montero P. Calcifying aponeurotic fibroma of the sole of the foot in an elderly patient. Foot (Edinb) 2019;40:64–67. doi: 10.1016/j.foot.2019.04.006. [DOI] [PubMed] [Google Scholar]
- 15.Ozcanli H, Ozaksar K, Cavit A, Gurer EI, Cevikol C, Ada S. Deep palmar tumorous conditions of the hand. J Orthop Surg. 2019;27(2):2309499019840736. doi: 10.1177/2309499019840736. [DOI] [PubMed] [Google Scholar]
- 16.Motta F, Scavo S, Vecchio GM, Fuccio-Sanzà G, Nicolosi F, Magro G. Calcifying aponeurotic fibroma: a core biopsy-based diagnosis. Pathologica. 2018;110(4):307–312. [PubMed] [Google Scholar]
- 17.Lee SM, Ha DH, Kang H, Rho JY. Intraarticular calcifying aponeurotic fibroma of the wrist: mimicking gout or calcium pyrophosphate dihydrate deposition disease. Skeletal Radiol. 2018;47(5):729–734. doi: 10.1007/s00256-017-2847-7. [DOI] [PubMed] [Google Scholar]
- 18.Chaltsev BD, Vasilyev VI, Pavlovskaya AI, Palshina SG, Nikonorova NO. Multiple calcifying aponeurotic fibroma: case report and review of the literature. Ter Arkh. 2018;90(4):91–95. doi: 10.26442/terarkh201890491-95. [DOI] [PubMed] [Google Scholar]
- 19.Sheikh RN, Karlic K. Calcifying aponeurotic fibroma of the hallux a case report. J Am Podiatr Med Assoc. 2018;108(1):68–73. doi: 10.7547/16-138. [DOI] [PubMed] [Google Scholar]
- 20.Romano N, Fischetti A, Mussetto I, Bianchi R, Muda A. Masson’s tumor and calcifying aponeurotic fibroma: two rare softtissue lesions in the same finger. High-resolution ultrasound features with histopathological correlations. Med Ultrason. 2017;19(4):457–461. doi: 10.11152/mu-1251. [DOI] [PubMed] [Google Scholar]
- 21.Corominas L, Sanpera I, Jr, Sanpera-Iglesias J, Ramos-Ansesio RF. Calcifying aponeurotic fibroma in children: our experience and a literature review. J Pediatr Orthop B. 2017;26(6):560–564. doi: 10.1097/BPB.0000000000000335. [DOI] [PubMed] [Google Scholar]
- 22.Sekiguchi T, Nakagawa M, Miwa S, Shiba A, Ozawa Y, Shimohira M, Sakurai K, Shibamoto Y. Calcifying aponeurotic fibroma in a girl: MRI findings and their chronological changes. Radiol Case Rep. 2017;12(3):620–623. doi: 10.1016/j.radcr.2017.04.009. [DOI] [PMC free article] [PubMed] [Google Scholar]
- 23.Lee SH, Lee IS, Song YS, Choi KU, Kim JI, Song JW. Calcifying aponeurotic fibroma of the knee: a case report with radiographic and MRI finding. Invest Magn Resonance Imaging. 2017;21(4):259–263. doi: 10.13104/imri.2017.21.4.259. [DOI] [Google Scholar]
- 24.Shim SW, Kang BS, Lee CC, Suh JH, Shim HS. MRI features of calcifying aponeurotic fibroma in the upper arm: a case report and review of the literature. Skeletal Radiol. 2016;45(8):1139–1143. doi: 10.1007/s00256-016-2412-9. [DOI] [PubMed] [Google Scholar]
- 25.Khullar G, De D, Tripathy S, Prakash M, Saikia UN, Handa S. Painful calcifying aponeurotic fibroma. Indian J Dermatol Venereol Leprol. 2016;82(4):449–52. doi: 10.4103/0378-6323.181503. [DOI] [PubMed] [Google Scholar]
- 26.Cho YH, Ahn KS, Kang CH, Kim CH. Calcifying aponeurotic fibroma of the dorsum of the foot: radiographic and magnetic resonance imaging findings in a four-year-old boy. Iran J Radiol. 2015;12(2):e23911. doi: 10.5812/iranjradiol.23911. [DOI] [PMC free article] [PubMed] [Google Scholar]
- 27.Nishio J, Inamitsu H, Iwasaki H, Hayashi H, Naito M. Calcifying aponeurotic fibroma of the finger in an elderly patient: CT and MRI findings with pathologic correlation. Exp Ther Med. 2014;8(3):841–843. doi: 10.3892/etm.2014.1838. [DOI] [PMC free article] [PubMed] [Google Scholar]
- 28.Schonauer F, Avvedimento S, Molea G. Calcifying aponeurotic fibroma of the distal phalanx. J Plast Reconstr Aesthet Surg. 2013;66(2):e47–e49. doi: 10.1016/j.bjps.2012.11.004. [DOI] [PubMed] [Google Scholar]
- 29.Thakur JS, Diwana VK, Sharma S, Thakur A. Calcifying (juvenile) aponeurotic fibroma of the scalp. Ear Nose Throat J. 2011;90(10):E14–E16. doi: 10.1177/014556131109001019. [DOI] [PubMed] [Google Scholar]
- 30.Takaku M, Hashimoto I, Nakanishi H, Kurashiki T. Calcifying aponeurotic fibroma of the elbow: a case report. J Med Invest. 2011;58(1–2):159–162. doi: 10.2152/jmi.58.159. [DOI] [PubMed] [Google Scholar]
- 31.Giuffre JL, Kovachevich R, Bishop AT, Shin AY. Recurrent calcifying aponeurotic fibroma of the thumb: case report. J Hand Surg Am. 2011;36(1):110–115. doi: 10.1016/j.jhsa.2010.09.004. [DOI] [PubMed] [Google Scholar]
- 32.Kramer JM, Doscher JC, Ruvinsky M, Fantasia JE. Calcifying aponeurotic fibroma with bone islands exhibiting hematopoiesis: a case report and review of the literature. Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2010;109(6):878–882. doi: 10.1016/j.tripleo.2010.01.020. [DOI] [PubMed] [Google Scholar]
- 33.Arora S, Sabat D, Arora SK, Kumar V, Saran RK. Giant intramuscular calcifying aponeurotic fibroma of gluteus maximus: case report. Ann Trop Paediatr. 2010;30(3):259–263. doi: 10.1179/146532810X12786388978922. [DOI] [PubMed] [Google Scholar]
- 34.DeComas AM, Heinrich SD, Craver R. Infantile fibrosarcoma successfully treated with chemotherapy, with occurrence of calcifying aponeurotic fibroma and pleomorphic/spindled celled lipoma at the site 12 years later. J Pediatr Hematol Oncol. 2009;31(6):448–452. doi: 10.1097/MPH.0b013e3181a1c0c4. [DOI] [PubMed] [Google Scholar]
- 35.Yura S, Terahata S, Ohga N, Ooi K. A case of calcifying aponeurotic fibroma arising in the medial pterygoid muscle. J Oral Maxillofac Surg. 2008;66(2):359–361. doi: 10.1016/j.joms.2006.10.032. [DOI] [PubMed] [Google Scholar]
- 36.Choi SJ, Ahn JH, Kang G, Lee JH, Park MS, Ryu DS, Jung SM. Calcifying aponeurotic fibroma with osseous involvement of the finger: a case report with radiologic and US findings. Korean J Radiol. 2008;9(1):91–3. doi: 10.3348/kjr.2008.9.1.91. [DOI] [PMC free article] [PubMed] [Google Scholar]
- 37.Oruç M, Uysal A, Kankaya Y, Yildiz K, Aslan G, Sengül D. A case of calcifying aponeurotic fibroma of the scalp: case report and review of the literature. Dermatol Surg. 2007;33(11):1380–1383. doi: 10.1111/j.1524-4725.2007.33296.x. [DOI] [PubMed] [Google Scholar]
- 38.Kim DH, Hwang M, Lee JI, Park JW. Acute median-nerve compression caused by calcifying aponeurotic fibroma. Am J Phys Med Rehabil. 2006;85(12):1017–1018. doi: 10.1097/01.phm.0000247781.86876.3e. [DOI] [PubMed] [Google Scholar]
- 39.Parker WL, Beckenbaugh RR, Amrami KK. Calcifying aponeurotic fibroma of the hand: radiologic differentiation from giant cell tumors of the tendon sheath. J Hand Surg Am. 2006;31(6):1024–8. doi: 10.1016/j.jhsa.2006.04.011. [DOI] [PubMed] [Google Scholar]
- 40.Hasegawa HK, Park S, Hamazaki M. Calcifying aponeurotic fibroma of the knee: a case report with radiological findings. J Dermatol. 2006;33(3):169–173. doi: 10.1111/j.1346-8138.2006.00039.x. [DOI] [PubMed] [Google Scholar]
- 41.Kwak HS, Lee SY, Kim JR, Lee KB. MR imaging of calcifying aponeurotic fibroma of the thigh. Pediatr Radiol. 2004;34(5):438–440. doi: 10.1007/s00247-003-1110-7. [DOI] [PubMed] [Google Scholar]
- 42.Sethi S, Mishra K, Rajni, Calcifying aponeurotic fibroma: a case report and review of literature. Indian J Pathol Microbiol. 2003;46(2):223–6. [PubMed] [Google Scholar]
- 43.Amaravati R. Rare malignant transformation of a calcifying aponeurotic fibroma. J Bone Joint Surg Am. 2002;84(10):1889. doi: 10.2106/00004623-200210000-00024. [DOI] [PubMed] [Google Scholar]
- 44.Sferopoulos NK, Kotakidou R. Calcifying aponeurotic fibroma: a report of three cases. Acta Orthop Belg. 2001;67(4):412–416. [PubMed] [Google Scholar]
- 45.Tai LH, Johnston JO, Klein HZ, Rowland J, Sudilovsky D. Calcifying aponeurotic fibroma features seen on fine-needle aspiration biopsy: case report and brief review of the literature. Diagn Cytopathol. 2001;24(5):336–339. doi: 10.1002/dc.1072. [DOI] [PubMed] [Google Scholar]
- 46.DeSimone RS, Zielinski CJ. Calcifying aponeurotic fibroma of the hand. a case report. J Bone Joint Surg Am. 2001;83(4):586–8. doi: 10.2106/00004623-200104000-00016. [DOI] [PubMed] [Google Scholar]
- 47.Lim TG, Park JH, Kim YK, Choi GS. A case of calcifying aponeurotic fibroma. Korean J Dermatol. 2001;39(8):930–932. [Google Scholar]
- 48.Fetsch JF, Miettinen M. Calcifying aponeurotic fibroma: a clinicopathologic study of 22 cases arising in uncommon sites. Hum Pathol. 1998;29(12):1504–1510. doi: 10.1016/S0046-8177(98)90022-3. [DOI] [PubMed] [Google Scholar]
- 49.Sharma R, Punia RS, Sharma A, Marwah N. Juvenile (calcifying) aponeurotic fibroma of the neck. Pediatr Surg Int. 1998;13(4):295–296. doi: 10.1007/s003830050322. [DOI] [PubMed] [Google Scholar]
- 50.Murphy BA, Kilpatrick SE, Panella MJ, White WL. Extra-acral calcifying aponeurotic fibroma: a distinctive case with 23-year follow-up. J Cutan Pathol. 1996;23(4):369–372. doi: 10.1111/j.1600-0560.1996.tb01312.x. [DOI] [PubMed] [Google Scholar]
- 51.Lu FH, Tzen CY, Chen BF, Chang PY. Calcifying aponeurotic fibroma: a report of three cases. Zhonghua Yi Xue Za Zhi (Taipei) 1995;56(2):139–142. [PubMed] [Google Scholar]
- 52.Hassel B. Calcifying aponeurotic fibroma. A case of multiple primary tumours. Case report. Scand J Plast Reconstr Surg Hand Surg. 1992;26(1):115–6. doi: 10.3109/02844319209035195. [DOI] [PubMed] [Google Scholar]
- 53.Kang JS, Kim TH, Park KB (1992) A case of calcifying aponeurotic fibroma. Korean J Dermatol 30:253–7
- 54.Yee DY, Mott RC, Nixon BP. Calcifying aponeurotic fibroma. J Foot Surg. 1991;30(3):279–83. [PubMed] [Google Scholar]
- 55.Rangwala AF, Bateyko R, Sacco M, Arvanitis C. Calcifying aponeurotic fibroma. N J Med. 1988;85(9):729–730. [PubMed] [Google Scholar]
- 56.Lafferty KA, Nelson EL, Demuth RJ, Miller SH, Harrison MW. Juvenile aponeurotic fibroma with disseminated fibrosarcoma. J Hand Surg Am. 1986;11(5):737–740. doi: 10.1016/S0363-5023(86)80024-7. [DOI] [PubMed] [Google Scholar]
- 57.Eisenbaum SL, Eversmann WW., Jr Juvenile aponeurotic fibroma of the hand. J Hand Surg Am. 1985;10(5):622–625. doi: 10.1016/S0363-5023(85)80196-9. [DOI] [PubMed] [Google Scholar]
- 58.Aprin H, Schwartz G, Lipper S. Juvenile nodular aponeurotic fibroma in the area of the knee joint. Clin Orthop Relat Res. 1984;190:257–259. doi: 10.1097/00003086-198411000-00045. [DOI] [PubMed] [Google Scholar]
- 59.Allen PW, Enzinger FM. Juvenile aponeurotic fibroma. Cancer. 1970;26(4):857–867. doi: 10.1002/1097-0142(197010)26:4<857::AID-CNCR2820260420>3.0.CO;2-S. [DOI] [PubMed] [Google Scholar]
- 60.Goldman RL. The cartilage analogue of fibromatosis (aponeurotic fibroma). Further observations based on 7 new cases. Cancer. 1970;26(6):1325–31. doi: 10.1002/1097-0142(197012)26:6<1325::AID-CNCR2820260620>3.0.CO;2-M. [DOI] [PubMed] [Google Scholar]
Associated Data
This section collects any data citations, data availability statements, or supplementary materials included in this article.
Data Availability Statement
The data that support the findings of this study are available on request from the corresponding author. The data are not publicly available due to privacy or ethical restrictions.

