镜下示良性平滑肌瘤。左侧为正常子宫平滑肌，右侧为高分化的平滑肌瘤，与正常者几乎无异，平滑肌瘤中可见平滑肌成编织状。
子宫平滑肌瘤：宫底粘膜下(大体) | 多发性 | 示红色变性（大体） | MRI盆腔矢状面 | 高分化
Here is the microscopic appearance of a benign leiomyoma. Normal myometrium is at the left, and the neoplasm is well-differentiated so that the leiomyoma at the right hardly appears different. Bundles of smooth muscle are interlacing in the tumor mass.