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Primary leiomyosarcoma of the seminal vesicle

A case of leiomyosarcoma of the seminal vesicle detected as a prerectal mass on routine per‐rectal examination is described in a 37‐year‐old man. Computed tomography scan confirmed it to be arising from the right seminal vesicle. Per‐rectal trucut biopsy showed malignant cells. Radical cystoprostatectomy with bilateral pelvic lymphadenectomy with anterior resection of rectum and urinary diversion with ileal conduit was performed. Microscopic examination of the resected specimen showed moderately differentiated leiomyosarcoma from the seminal vesicle. The patient received adjuvant chemotherapy and sandwiched radiotherapy. He is well and free of tumor 20 months after surgery.