A benign smooth muscle neoplasm arising from the prostate. It is characterized by the presence of spindle cells with cigar-shaped nuclei, interlacing fascicles, and a whorled pattern. The disease is prostate leiomyoma (MONDO_0002452). Also known as: leiomyoma of prostate, leiomyoma of prostate gland, leiomyoma of the prostate, prostate gland leiomyoma, prostatic leiomyoma.