Prostatic Leiomyoma: An Uncommon Diagnosis Found in Clinically Suspected Cases of Severe Benign Prostatic Hyperplasia Without Elevated Serum Total Prostate-Specific Antigen Levels.

Leiomyomas of the prostate are uncommon benign tumors. We report the case of a 67-year-old man who underwent an emergent, open prostatectomy for symptomatic relief of clinically severe benign prostatic hyperplasia (BPH). Ultrasound showed a severe prostatic enlargement with urinary tract obstruction. Gross pathology findings showed a 134-g prostate gland containing a 2.5-cm-long, well-circumscribed lesion. Histological findings showed a bland, smooth muscle neoplasm with positive staining for smooth muscle markers. No necrosis, nuclear atypia, or mitoses are identified. In such cases, gross and microscopic examination of adequately sampled lesions is necessary to assure a conclusive diagnosis and to exclude overt stromal malignancies, such as leiomyosarcoma.