A benign smooth muscle neoplasm arising from the urethra. It is characterized by the presence of spindle cells with cigar-shaped nuclei, interlacing fascicles, and a whorled pattern. The disease is urethra leiomyoma (MONDO_0002222). Also known as: leiomyoma of the urethra, leiomyoma of urethra, urethral leiomyoma.