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. 2017 Jul 21;17:509. doi: 10.1186/s12879-017-2605-4

Staphylococcus aureus Prostatic abscess: a clinical case report and a review of the literature

David E Carroll 1,4,5,✉, Ian Marr 1,2, G Khai Lin Huang 1, Deborah C Holt 3, Steven Y C Tong 1,3,6,7, Craig S Boutlis 1,2
PMCID: PMC5521102  PMID: 28732492

Background

Prostatic abscess is a rare complication of acute bacterial prostatitis, described in 0.5 to 2.5% of patients presenting with inflammatory prostatitis [1]. Patients with prostatic abscess typically present with difficulty urinating or with acute urinary retention. The most common causative pathogens include Enterobacteriaceae such as Escherichia coli [2], or in our local clinical context in northern Australia, Burkholderia pseudomallei [3]. Staphylococcus aureus, a Gram-positive coccus, is a common human pathogen, yet is a rarely reported cause of prostatic abscess [1].

We report here a case of prostatic abscess due to S. aureus in a man who presented to our institution and contextualise this with a literature review.

Case presentation

The patient was a 53 year-old Indigenous Australian who presented to a remote regional hospital in northern Australia with acute onset urinary retention. His past history included type 2 diabetes mellitus, chronic hepatitis B infection and recurrent skin and soft tissue infections. He also had a history of long-term kava use.

An indwelling urinary catheter (IDC) was inserted and culture performed of the IDC urine specimen; however, the patient refused further treatment and self-discharged the same day (following removal of the IDC). At day 2, the initial urine culture revealed methicillin-resistant S. aureus (MRSA).

The patient was recalled and admitted to hospital. His urinary symptoms and associated suprapubic pain persisted. He had difficulty ambulating due to pain in his left thigh. A digital rectal examination revealed a firm prostate of normal size, without tenderness, and a tender diffuse swelling was noted in the medial left thigh. A beside ultrasound of the thigh revealed a hypoechoic lesion measuring 74x52x61 mm with an estimated volume of 123 mL. The patient had blood taken for culture, was then commenced on intravenous vancomycin and then transferred by air ambulance to our institution, where he was admitted for ongoing care.

Laboratory tests on admission showed a total leucocyte count of 12.7 × 109/L (neutrophil count, 8.7 × 109/L) and a CRP of 65 mg/L (reference range 0.0–5.0 mg/L). Serological testing for B. pseudomallei was negative at <1:20 using indirect haemagglutination. B. pseudomallei was not isolated from throat or rectal swabs after culture in Ashdown’s medium [4]. Urine culture again isolated a pure growth of MRSA, with reported antibiotic sensitivity to clindamycin but resistance to trimethroprim. This profile is consistent with non–multidrug-resistant, methicillin-resistant S. aureus (nmMRSA; isolates being defined phenotypically as those resistant to less than 3 non–beta lactam antibiotic classes [5]). An ulcer present on the right great toe was swabbed and was also culture-positive for nmMRSA with an identical antibiogram. Skin scrapings on this admission tested positive for Sarcoptes scabei and his clinical condition was consistent with a concomitant diagnosis of crusted (previously, Norwegian) scabies. He also had an ulcer on his right great toe.

A CT scan of the abdomen and pelvis showed multiple prostatic abscesses including a prominent expansive abscess within the left base and multiple loculations within the apex (Additional file 1: Fig. S1).

At day 2 post-transfer, screening blood cultures isolated nmMRSA with the same antibiogram as was found in urine on the first assessment. Vancomycin Etest® showed an MIC of 1.5 μg/mL.

This patient underwent immediate surgical drainage of the thigh abscess on day 1 following transfer and at day 5 underwent trans-rectal ultrasound guided drainage of the prostate, whereupon 5 mL of purulent fluid was aspirated from the superior margin of the left lobe. The prostate aspirate and operative samples from the thigh abscess cultured nmMRSA with the same resistance profile as previously; B. pseudomallei was not isolated. The collections of fluid in the right lobe of the prostate were unable to be drained because of their small size, anatomical location and thickness of the wall of the prostate.

A follow-up CT scan post-drainage of the prostatic abscess showed interval improvement in the loculated right prostatic abscess; however, the left-sided collection appeared unchanged with possible enlargement (Additional file 2: Fig. S2), measuring 21 × 35 mm compared with 19 × 21 mm prior to drainage. Following three days of IV antibiotic therapy and following surgical drainage of the abscess, surveillance blood cultures were negative. Transthoracic echocardiogram showed no evidence of endocarditis.

The patient was continued on intravenous vancomycin with addition of oral clindamycin because of its recognised prostatic penetration [6]. He declined further surgical drainage options. The patient improved clinically and received a total 4 weeks of intravenous vancomycin plus oral clindamycin therapy. Repeat imaging at the completion of IV therapy showed some residual abscess collection (not shown). Further surgical intervention was discussed with the patient and was declined. Repeat imaging performed 5 months later showed the prostatic abscess had completely resolved.

Molecular microbiological genotype of disease

The S. aureus isolates recovered from the blood cultures and an additional isolate recovered from the prostate aspirate underwent molecular genotyping as previously described [7]. The isolates genotyped as Clonal Complex (CC) 5. Notably, lukPV (encoding for Panton-Valentine leucocidin [PVL]) was detected by PCR in both isolates.

Literature review

Methods

Two investigators independently and in duplicate conducted a review of the literature searching the MEDLINE and Cochrane databases for the terms “(prostate OR prostatic) AND aureus AND abscess*” from January 1946 through January 2017 inclusive to identify all relevant published literature. Non-MEDLINE indexed literature was also consulted and citation searching was undertaken on all results to identify further studies. Results were limited to peer-reviewed publications in English. Approval for this case report and study was granted by the Human Research Ethics Committee of the Northern Territory Department of Health and the Menzies School of Health Research (HREC number 2015–2457).

Results

Thirty nine publications were identified. After screening the titles and abstracts, 21 publications met the inclusion criteria and were thus eligible for full-text review. An additional 14 papers were identified by reference screening for further citations that met inclusion criteria. The case presented in this study has been added to studies identified in the review.

These 35 full-text papers included a total of 39 patients with a diagnosis of S. aureus prostatic abscess. With our report of a further case, this led to a review of 40 cases. The summary of the literature search is displayed in Table 1.

Table 1.

Summary of the current literature on S. aureus prostatic abscess

Ref Age Susceptibility Presentation Risk Factors Bacteremia Drainage Antibiotic Used Outcome
[8] 42 MRSA Dysuria, urinary retention, abdominal pain Urinary retention No Transrectal Levofloxacin, metronidazole, fluconazole Resolution
[14] 31 MRSA Dysuria, abdominal pain Immunosuppression, recent IDC, T2DM, liver transplant Yes No drainage. Vancomycin, ceftriaxone, daptomycin Resolution
[15] 20 MSSA + PVL Dysuria None Yes Transrectal Ceftriaxone, amikacin, ciprofloxacin, rifampicin, ofloxacin, fosfomycin Resolution
[16] 56 MRSA Dysuria, polyuria, difficulty urinating Diabetes mellitus No Radiology guided then TURP Vancomycin Resolution
[17] 47 MRSA Diffuse myalgias, dry cough, anorexia, dyspnea, fever, and chills Recent penile furuncle, history of hypospadias with urethral stricture No No drainage Vancomycin, piperacillin/tazobactam Death
[17] 31 MRSA Left-sided pleuritic chest pain, fevers, rigors, and fatigue Sickle beta Yes Transrectal and TURP Vancomycin, piperacillin/tazobactam, daptomycin, TMP-SMX Resolution
[18] 52 MRSA Abdominal pain, urinary frequency Diabetes mellitus Yes TURP Vancomycin, TMP-SMX, rifampin Resolution
[19] 47 MRSA Dysuria, pyrexia, urinary frequency, rectal tenesmus, right flank pain None No TURP Vancomycin, piperacillin-tazobactam, linezolid. Resolution
[19] 20 MRSA Pyrexia, lower abdominal pain and perineal discomfort IVDU, hepatitis C No Transurethral Vancomycin, piperacillin-tazobactam, linezolid Resolution
[20] 49 MRSA Dysuria, urinary retention, pyrexia, scrotal pain and oedema, constipation BPH No TURP Vancomycin Resolution
[21] 15 MRSA Left buttock pain, constipation and difficulty ambulating Previous bilateral lower extremity and back abscesses - grew MRSA No TURP Clindamycin, piperacillin-tazobactam, then vancomycin, linezolid Resolution
[22] 49 MRSA Difficulty urinating, low back pain Diabetes mellitus Yes TURP Vancomycin, doxycycline Resolution
[23] 65 MSSA Dysuria, flank pain, and urinary retention, constipation, suprapubic pain Diabetes mellitus Yes Transurethral drainage. Ceftriaxone, ciprofloxacin Resolution
[24] 45 MRSA Dysuria, perineal discomfort, rectal tenesmus and intermittent pyrexia Diabetes mellitus Yes Percutaneous, TURP Vancomycin Resolution
[25] 59 MRSA Dysuria, urinary frequency, pyrexia, rectal and perineal pain Diabetes mellitus, alcoholism Yes Percutaneous Vancomycin, TMP-SMX, ciprofloxacin Resolution
[26] 40 MRSA Fever, urinary hesitancy, intermittent abdominal pain HIV Yes Transperineal Vancomycin, gentamicin Resolution
[27] 50 MSSA Urinary retention Diabetes mellitus, alcoholism No No drainage Ciprofloxacin Resolution
[28] 51 MRSA Dysuria, fever, suprapubic pain HIV, sepsis, adult respiratory distress syndrome, and renal failure Yes Transurethral Vancomycin, ciprofloxacin, TMP-SMX Death
[29] 64 MRSA Dysuria,fatigue, anorexia, and weight loss Diabetes mellitus Yes Percutaneous Vancomycin Resolution
[30] 55 MRSA Urinary hesitancy and rectal pain BPH Yes. No Drainage Vancomycin Resolution
[31] 56 MRSA Difficulty urinating, hematuria, fever, chills and low back pain Diabetes mellitus, BPH, history of self-digital rectal examinations Yes. Percutaneous, TURP Vancomycin, rifampin Resolution
[32] 29 MRSA Persistent pyrexia and superficial skin abscesses on his left calf. Worsening suprapubic and perineal pain Straddle injury to urethra, urethroplasty, hepatitis C No Cope loop catheter placement Vancomycin Resolution
[33] 43 MRSA Dysuria, hesitancy, slow stream, night sweats, flushing, and perineal pain Intravenous drug abuse, hepatitis C Yes TURP Vancomycin, nafcillin, TMP-SMX Resolution
[34] 63 MRSA Urinary retention, pyrexia Recent scrotal drainage, T2DM Yes Percutaneous, TURP Vancomycin Unknown
[35] 59 SA [unknown susceptibility] Difficulty passing urine Recent salivary gland abscess treated with antibiotics No Transperineal, TURP Ciprofloxacin, erythromycin Resolution
[36] 35 SA “clinical acute prostatitis” HIV, bilateral renal abscesses No No drainage “IV antibiotics” Resolution
[37] 42 MSSA Dysuria. urethral discharge, perineal pain No No Transperineal Oxytetracycline Resolution
[38] 43 SA [unknown susceptibility] Dysuria, haematuria, pyrexia, purulent discharge Recent pelvic infection and pelvic surgery No Transurethral Gentamicin, carbenicillin. Resolution after relapse
[9] 54 MSSA Perineal pain Mycosis fungoides No Transperineal, TURP Oxacillin, tobramycin Resolution
[39] 53 MRSA Urinary urgency, fatigue, chills, rigors, and fever Diabetes mellitus, Obesity Yes No drainage Vancomycin, TMP-SMX, rifampin Resolution
[40] 50 MRSA + PVL Abdominal pain, cough, fever, weight loss, malaise Diabetes mellitus Yes CT guided drainage Vancomycin, levofloxacin, daptomycin Resolution
[41] 46 MRSA Acute urinary retention, dysuria, constipation Instrumentation Yes Transurethral IV Antibiotics Resolution
[42] 57 MRSA Dysuria, haematuria, pyrexia Diabetes Mellitus Yes TURP Ceftriaxone, vancomycin Resolution
[43] 67 SA[unknown susceptibility] Acute urinary retention, perineal pain, dysuria, pyrexia Diabetes mellitus Yes No drainage Ciprofloxacin Resolution
[44] 12 SA [unknown susceptibility] Acute urinary retention, pyrexia None - Transurethral “anti-bacterials” Resolution
[45] 69 SA [unknown susceptibility] Pyrexia, lethargy and problems voiding Diabetes mellitus Yes Transurethral Ampicillin, oxacillin Resolution
[46] Newborn MSSA Urinary retention No No No drainage No therapy Resolution
[46] 14 days MSSA Urinary retention, diarrhoea, bladder distension No No Open drainage No therapy Resolution
[46] 3 weeks MSSA Abdominal distension Hirschsprung’s disease Yes Open drainage No therapy Death
This case 52 nmMRSA + PVL Urinary retention Diabetes mellitus, crusted scabies, long term kava use Yes Transrectal Vancomycin, clindamycin Resolution
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Legend: BPH [Benign Prostatic Hypertrophy]; CT [Computed Tomography]; HIV [human immunodeficiency virus]; IDC [Indwelling catheter]; IV [Intravenous]; PVL [Panton Valentine leucocidin]; SA [Staphylococcus aureus]; MSSA [Methicillin-sensitive Staphylococcus aureus]; nmMRSA [non–multidrug-resistant, methicillin-resistant Staphylococcus aureus]; MRSA [Methicillin-resistant Staphylococcus aureus]; T2DM [Type 2 Diabetes mellitus]; TMP-SMX [Trimethoprim/sulfamethoxazole]; TURP [transurethral resection of the prostate]

Clinical presentation

The most common clinical presentations of prostatic abscess in this population were pain (abdominal or perineal) and pyrexia. This was followed by dysuria and urinary retention (Table 2). In our case, the presenting complaint was similar to those in previously published cases.

Table 2.

Symptoms in patients with S. aureus prostatic abscess

Symptom Total No. Patients (40) % Of Patients
Pain/discomfort 21 52.5%
Pyrexia 20 50%
Dysuria 17 42.5%
Urinary retention 11 27.5%
Difficulty micturating 8 20%
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MRSA was the dominant strain type causing prostatic abscess in the published literature, being identified in 26 (65%) cases of disease, including in the case that we report here. MSSA was identified as the causative strain in 8 cases. In 6 cases, the susceptibility of the causative bacterium was unreported. Genes encoding for PVL were identified in 3 cases, most notably in our case; however, there is little detail on how frequently the presence of lukSF-PV was sought in the existing literature.

Risk factors for developing S. aureus prostatic abscess

Risk factors observed in this population of S. aureus associated prostatic abscesses include: diabetes mellitus, prior urethral instrumentation or catheterisation, prostatitis, and immunocompromise (Table 3).

Table 3.

Risk Factors in patients with S. aureus prostatic abscess

Risk factor Total No. Patients (40) % Of Patients
Diabetes mellitus 17 42.5%
History of urological disease 5 12.5%
Recent surgery/instrumentation 5 12.5%
Immunosuppression (inc. HIV) 4 10%
Hepatitis C 3 7.5%
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Bacteraemia

23/40 (57.5%) cases in this report had positive blood culture results for S. aureus but due to variable quality of reporting in the literature, we are unable to determine if all cases had blood cultures taken. In addition one patient [8] had urinary cultures positive for Candida albicans and one patient [9] was co-infected with E. coli, Bacteroides and Klebsiella pneumoniae.

Treatment

The majority of patients identified were treated with antibiotic therapy, most commonly with vancomycin. 22/40 (55%) patients were treated with antibiotic combinations, 15/40 (37.5%) were treated with mono-therapy and 3/40 (7.5%) with no antibiotic therapy (Table 4). In those patients with S. aureus bacteraemia (SAB), in addition to prostatic disease, vancomycin was again the most frequently used antibiotic, in keeping with international guidelines [10].

Table 4.

Antibiotic Choice in patients with S. aureus prostatic abscess

Antibiotic Total No. Patients [44] % Patients
Vancomycin 24 60%
Trimethoprim/Sulfamethoxaxole 6 15%
Ciprofloxacin 7 17.5%
Piperacillin + Tazobactam 5 12.5%
Rifampin 4 10%
Cefriaxone 4 10%
Linezolid 3 7.5%
Daptomycin 3 7.5%
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There is a paucity of evidence regarding the role of drainage in the treatment of prostatic abscess. In our review, 26/40 (65%) cases underwent drainage (Table 5). Several patients required drainage on more than one occasion. On each of those occasions, a trans-rectal or trans-perineal approach was followed by a transurethral approach to achieve successful drainage.

Table 5.

Method of drainage in patients with S. aureus prostatic abscess

Drainage Total No. Patients (40) % Of Patients
Transurethral drainage 22 55%
Percutaneous drainage 8 20%
No drainage 8 20%
Transperineal drainage 5 12.5%
Transrectal drainage 4 10%
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Clinical outcome, microbiological outcome and relapse

In this review, 36/40 (90%) of cases identified resolved, one of which was following an initial relapse. Three cases died and the outcome in one case was unknown.

Discussion

S. aureus is a major human pathogen that causes a wide range of clinical infections and there is a heavy burden of staphylococcal disease in Indigenous people [5]. Prostatic abscess resulting from S. aureus infection is very uncommon relative to its propensity to cause other human infections, with only 39 cases previously reported in the English language literature.

We have reported a case from our institution that had a common presentation of urinary retention as well as numerous risk factors identified in our literature search. These included diabetes mellitus, instrumentation of the urinary tract, and bladder outlet obstruction. Both the diagnosis of crusted scabies and a great toe ulcer are risk factors for bacteraemia and in the absence of chronicity, one of these percutaneous routes is likely to have been a source for his S. aureus bacteraemia and prostatic abscess.

The S. aureus isolates in this case were genotyped as CC5-MRSA and carried genes for the bi-component leukocidin PVL and was resistant to trimethoprim. This has similar genotypic properties to an emerging clone in the neighbouring jurisdiction of north Western Australia [11].

From a limited sample size, it appears that with prompt identification, diagnosis and management, this condition is treatable with a low case fatality rate. However, there are no guidelines for management of S. aureus prostatic abscess. Treatment of prostatic abscesses usually involves the use of broad-spectrum antibiotics directed at Enterobacteriaceae, with or without drainage. In our experience the decision to drain an abscess depends on several factors: the size of the abscess, accessibility and ease of drainage, and the patient’s response to antibiotic therapy. The sample size of this study and methodology involved means that we cannot draw firm conclusions on the evidential basis of draining prostatic abscesses caused by S. aureus. A single-centre retrospective study of drainage in prostatic abscess recommended that trans-rectal drainage is the best option for drainage in selected cases of prostatic abscess [12].

Our case is the first report of using clindamycin step-down therapy following IV therapy. Our use of clindamycin was driven by its excellent prostatic penetration, in which prostatic levels of clindamycin have been reported to exceed that of serum levels [13]. Options for drainage of prostatic abscess include trans-rectal, trans-perineal or transurethral approaches. In the case we reported here, the abscess was drained trans-rectally and was uncomplicated in this patient.

Further research

There is variable consistency in what was reported in the literature and this made it difficult to synthesise the results to make recommendations for practice. Further research and reporting of S. aureus prostatic abscess with a standardised approach is required for understanding the pathogenesis and treatment of this uncommon condition. In this study, we have reported correlations between risk factors and the development of S. aureus prostatic abscess.

Conclusions

Prostatic abscess is an uncommonly reported manifestation of S. aureus infection that has a non-specific clinical presentation, which can include abdominal and/or urinary symptoms. Most published cases have been due to MRSA. Specific risk factors include diabetes mellitus, immunosuppression, instrumentation of the urinary tract, and bladder outlet obstruction. Drainage is likely to accelerate cure but the optimal method remains undefined. While there are no published guidelines, clindamycin may be particularly useful for directed therapy of susceptible organisms given its excellent prostate penetration (along with bactericidal antibiotics in cases with bacteraemia).

Additional files

Additional file 1: Figure S1. (477.9KB, png)

CT of pelvis showing prostatic abscess in the left lobe of the prostate. (PNG 477 kb)

Additional file 2: Figure S2. (447.8KB, png)

CT of pelvis showing persistence of prostatic abscess in the left lobe of the prostate. (PNG 447 kb)

Acknowledgements

We would like to acknowledge the participant in this study and are grateful for his contribution.

Funding

No funding was received for the purposes of this study.

Availability of data and materials

All available data is presented within the manuscript and additional supporting files.

Authors‘contributions

DEC completed the first draft of the manuscript, contributed to drafting and critically reviewing the manuscript during the course of submission and collected data throughout. IMM and GKLH were directly responsible for the patient, performed the clinical examinations and contributed to drafting and critically reviewing the manuscript during the course of submission. CSB conceived, supervised and coordinated the study, contributed to critically reviewing the manuscript and signed off on the final manuscript. DCH and SYCT provided laboratory support, analysed and interpreted data, and critically revised the manuscript. All the authors read and approved the final version of the manuscript.

Ethics approval and consent to participate

Approval for this case report and study was granted by the Human Research Ethics Committee of the Northern Territory Department of Health and the Menzies School of Health Research (EC00163, approval number 2015–2457).

Consent for publication

Written informed consent was obtained from the patient for publication of this case report and any accompanying images. Copies of the written consent are available for review by the editor of this journal.

Abbreviations

BPH

Benign Prostatic Hypertrophy

CT

Computed Tomography

HIV

Human immunodeficiency virus

IDC

Indwelling catheter

IV

Intravenous

MRSA

Methicillin Resistant Staphylococcus aureus

MSSA

Methicillin Sensitive Staphylococcus aureus

nmMRSA

non–multidrug-resistant, methicillin-resistant Staphylococcus aureus

PVL

Panton-Valentine leucocidin

SA

Staphylococcus aureus

T2DM

Type 2 Diabetes mellitus

TMP-SMX

Trimethoprim/sulfamethoxazole

TURP

Transurethral Resection of the Prostate

Competing interests

The authors declare that they have no competing interests.

Publisher’s Note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Footnotes

Electronic supplementary material

The online version of this article (doi:10.1186/s12879-017-2605-4) contains supplementary material, which is available to authorized users.

Contributor Information

David E. Carroll, Email: dcarroll06@qub.ac.uk

Ian Marr, Email: ian.marr@hnehealth.nsw.gov.au.

G Khai Lin Huang, Email: khai.huang@mh.org.au.

Deborah C. Holt, Email: deborah.holt@menzies.edu.au

Steven Y. C. Tong, Email: steven.tong@mh.org.au

Craig S. Boutlis, Email: craig.boutlis@nt.gov.au

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Associated Data

This section collects any data citations, data availability statements, or supplementary materials included in this article.

Supplementary Materials

Additional file 1: Figure S1. (477.9KB, png)

CT of pelvis showing prostatic abscess in the left lobe of the prostate. (PNG 477 kb)

Additional file 2: Figure S2. (447.8KB, png)

CT of pelvis showing persistence of prostatic abscess in the left lobe of the prostate. (PNG 447 kb)

Data Availability Statement

All available data is presented within the manuscript and additional supporting files.

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