Malignant Hemangiopericytoma of the Bladder: Case Report and Literature Review

Abstract

Journal of Urology and Nephrology Open Access Open Access Mini Review retention. A urine culture showed no growth. No cytology specimen was obtained. A contrasted Computed Tomography (CT) scan was obtained and demonstrated an enlarged prostate with a prominent median lobe and evidence of an intravesical bladder neck mass without lymphadenopathy (Figure 1). Follow up cystoscopy clearly showed tan, friable bladder neck mass. After transurethral resection, pathology identified a solitary fibrous tumor with diffuse mitotic features concerning for malignancy. Due to these features and the site of tumor being the trigone and bladder neck, a partial cystectomy was unfeasible. The patient elected to undergo a radical cystoprostatectomy with ileal conduit diversion. A 6.5 X 4 X 4.5 cm butterfly shaped tanwhite solid mass at the junction of the bladder neck was present without invasion into the prostate (Figure 2). Histologically, this was a spindle cell neoplasm composed of hypercellular sheets of atypical cells with transition areas of less cellularity. The hypercellular areas had cells with enlarged, hyperchromatic, nuclei with minimal cytoplasm and increased mitoses (up to 13 per 10 high power fields) (Figure 3a). The less cellular areas were characterized by scattered, thin-walled,