leiomyoma (MONDO_0001572) is a well-circumscribed benign smooth muscle neoplasm characterized by the presence of spindle cells with cigar-shaped nuclei, interlacing fascicles, and a whorled pattern. Also known as: fibroid, fibroid neoplasm, fibroid tumor, fibroid tumour, leiomyoma, benign, leiomyomatous neoplasm, leiomyomatous neoplasm (morphologic abnormality), leiomyomatous tumor.