子宫底突出腔内的结节状物为平滑肌瘤。此为粘膜下(可发生于肌层、粘膜下、浆膜下)平滑肌瘤。临床较常见，可能20%的妇女可能出现。如图示发生在子宫内膜下的或更大的平滑肌瘤可能导致不规则阴道出血。

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

In the upper fundus of the uterus protruding into the endometrial cavity is a nodule that proved to be a leiomyoma. Thus, this is a submucosal leiomyoma. Such benign smooth muscle tumors of the myometrium are very common, perhaps 1 in 5 women has one. They may be the cause of irregular bleeding if placed submucosally, as seen here, or if large.