Leiomyoma of the urethra and bladder.

摘要

Leiomyomas are benign tumors of smooth muscle origin occurring throughout the genitourinary system, most commonly in the renal capsule. Bladder and ure-thral leiomyomas are uncommon, with approximately 200 reported cases to date. Although bladder leiomyoma accounts for less than 1% of bladder tumors, it is the most common benign soft tissue neoplasm of the bladder. The etiology and pathogenesis of these tumors are unclear, although some have hypothesized a hormonal influence, a concept supported by reports of enlargement during pregnancy and shrinkage after delivery, as well as demonstration of the presence of estrogen receptors by immunohistochemistry in 1 case.