Table 1.
Summary of osteolipomas about the knee, clinical, and radiologic data.
| Case | Reference | Age/sex | Location | Size, cm | X-ray | MR appearance | Symptoms/duration | Treatment/follow-up |
|---|---|---|---|---|---|---|---|---|
| 1 | Cheng et al | 21/M | Distal femur | 12 × 6 × 2 | NA | T1: well-demarcated, heterogeneous T2: lobular contour, heterogeneous signal intensity |
Activity-related pain/36 mo | Excision/no recurrence at 6 mo |
| 2 | Hashmi et al | 45/F | Distal femur | 8 × 6.5 × 14 | Ossification with fine trabeculation | T1/T2: lobulated and trabeculated areas | Painless mass/1.5 y | Biopsy/NA |
| 3 | Fritchie et al | 51/M | Lateral anterior Infra-patellar knee |
4.2 × 4 × 2.8 | Mass with calcific stippling | T1: heterogeneous low T2: heterogeneous low and high C: intense heterogeneous enhancement |
Painless mass/3 mo | Excision/no recurrence at 8 mo |
| 4 | Fritchie et al | 31/F | Infrapatellar tendon | 5.2 × 4.3 × 4.1 | Retropatellar mass | T1: heterogeneously isointense and hypointense to fat. C: brisk enhancement in nonfatty components |
Nontender, irritating mass/1 y | Excision/no recurrence at 25 mo |
| 5 | Pudlowski et al | 53/M | Suprapatellar bursa | 5.5 × 4.5 × 2.5 | Ossified mass | NA | Pain, swelling, instability/5 mo | Medial meniscectomy/NA |
| 6 | 64/M | Anterior knee joint | 8.1 × 3.7 × 1.1 | Ossified mass | T1: well-circumscribed, heterogeneously lobular C: intense heterogeneous enhancement throughout |
Knee pain, exacerbated by activity/12 mo | Excision/NA |
M, male; F, female; NA, not available; C, contrast-enhanced.