bladder leiomyoma (MONDO_0001634) is a well-circumscribed benign smooth muscle neoplasm arising from the bladder. It is characterized by the presence of spindle cells with cigar-shaped nuclei, interlacing fascicles, and a whorled pattern. Also known as: leiomyoma of bladder, leiomyoma of the bladder, leiomyoma of the urinary bladder, leiomyoma of urinary bladder, urinary bladder leiomyoma.