Primary sarcoma of the specialised prostatic stroma: a case report and review of the literature

Primary prostate sarcoma: how to manage following diagnosis at transurethral resection

Primary prostate sarcomas are rare, reportedly comprising just 0.7% of all prostate malignancies. Here, we present the case of a 66-year-old man who was diagnosed with prostate stromal sarcoma after undergoing a routine transurethral resection of prostate for bladder outflow obstruction. Primary prostate sarcoma can be aggressive even when low-grade, with a high risk of local recurrence and, high malignant potential when high-grade. They require aggressive multimodality treatment with surgery, chemotherapy and radiotherapy for durable survival outcomes. They also require close surveillance with long-term follow-up.

Gastrointestinal stromal tumor with an unusual presentation as an enlarged prostate gland: a case report and review of the literature

We report a case of a 78-year-old male who presented with urinary retention, constipation and an enlarged prostate gland. A transurethral resection of the prostate (TURP) was performed. Pathologic examination revealed a hypercellular-spindled neoplasm with frequent mitoses, nuclear pleomorphism, and multifocal geographic tumoral necrosis. A pathologic diagnosis of gastrointestinal stromal tumor (GIST) was made based on morphologic and immunohistochemical findings, and was later reinforced by molecular study results. This lesion was initially thought to represent a primary prostatic GIST. To the best of our knowledge, there have been only five cases of primary prostatic GISTs. Subsequent imaging studies revealed the mass to be contiguous with the anterior rectal wall, suggesting the possibility of a rectal primary with extension to the prostate gland. The patient was treated with imatinib mesylate, and after twelve months of follow up failed to demonstrate any evidence of progression or metastatic disease. GIST should be considered in cases of prostatic tumors with a spindled or epithelioid morphology, and immunohistochemistry and possible molecular studies are recommended to aid in diagnosis and guide treatment decisions.

Is it really an abscess? An unusual case of metastatic stromal cell sarcoma of the prostate

•

Prostatic stromal sarcomas account for about 0.1% of all prostatic malignancies.

•

The preferred treatment is surgery by radical prostatectomy or cystoprostatectomy.

•

Local recurrence occurs in to bladder, seminal vesicles and rectum.

•

Distal metastasis, has so far only been reported in lung and bone.

•

Subcutaneous metastasis of a prostatic stromal cell sarcoma has not been reported before.

Introduction

Prostatic stromal sarcomas account for about 0.1% of all prostatic malignancies. Local recurrence into bladder, seminal vesicles and rectum has been documented. Distal metastasis, has so far only been reported in lung and bone.

Presentation of case

We report the case of a 42 year old man with a subcutaneous metastatic deposit of a prostatic stromal cell sarcoma 5 years after radical prostatectomy. Additional staging with CT- and PET-scan showed lymph node involvement in the neck and left axilla. A core biopsy of the skin lesion was undertaken, of which the histology revealed a low grade spindle cell tumour that was morphologically identical to a previously diagnosed prostatic stromal sarcoma.

Discussion

In literature distant metastases to the lung and bone have been documented before. This is the first documented case of a subcutaneous metastasis of prostatic stromal cell sarcoma.

Conclusion

The preferred treatment for prostatic stromal cell sarcoma is surgery by radical prostatectomy or cystoprostatectomy. There is currently not enough literature on the topic to elucidate the role of chemo- or radiotherapy in loco-regional or distant spread.

Primary spindle cell sarcoma of the prostate and (18)F-fluorodeoxyglucose-positron-emission tomography/computed tomography findings

Background:

Primary sarcoma of the prostate is extremely rare and accounts for 0.1% of all prostate cancers. This type of cancer is associated with poor prognosis due to aggressive biological behavior. The World Health Organization histologically classified prostate sarcomas as stromal tumor of unknown malignant potential (STUMP) and stromal sarcoma.

Patients and Methods:

A 39-year-old patient presented with lower urinary tract symptoms over the last few months. On digital rectal examination, the right lobe of the prostate was diffusely hard on palpation. Prostate-specific antigen was 0.5 ng/ml. A biopsy specimen was obtained with the guidance of transrectal ultrasonography. Immunohistochemical examination revealed positive staining for vimentin, actin, and desmin.

Results:

¹⁸F-fluorodeoxyglucose-positron-emission tomography/computed tomography scans obtained for staging purposes with the diagnosis of primary spindle cell carcinoma of the prostate revealed widespread lung and liver metastases. A doxorubicin-based systemic chemotherapy (CTx) was initiated.

Conclusion:

Spindle sarcomas of the prostate have quite aggressive nature and they have high potential to metastase. Average life expectancy is <1 year and the prognosis is poor. CTx and radiation therapy can’t yield curative effects due to poor differentiation.