Interlacing bundles of smooth muscle fibres, which may be interspersed by varying amounts of fibrous connective tissue |
Bundles of fibers may form whorls because of their fasicular arrangement in varying planes |
Nuclei are typically spindle shaped with blunt ends and quite vesicular |
Mitotic figures are uncommon |
Rare cells may exhibit nuclear pleomorphism |
Necrosis and invasion are absent |
Mucinous degeneration, hyalinization or fibrosis, and adipocytes can be seen, but these features are usually focal and more likely seen in larger lesions |
Occasionally leiomyomas have a prominent fibroblastic or myxoid component. |