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 at least 1 in 5, or even half of all women, has at least one. They may be the cause of irregular bleeding with menometrorrhagia, if present in a submucosal location, as seen here. Larger leiomyomas may also produce bleeding or pelvic discomfort.