Adenomyomas are benign tumors which have endometriotic tissue and smooth muscle tissue. They are typically located within the uterus. Extrauterine adenomyomas located in ovary, broad ligament, small bowel mesentery are rare entity. Extrauterine adenomyomas like as adenomyoma within the uterus have central cavity lined by functional endometrial tissue and surrounded by smooth muscle resembling uterine structure. Extrauterine adenomyomas can occur anywhere in pelvic cavity or abdomen. Among them, extrauterine adenomyoma invading sigmoid colon is extremely rare. We described two case of extrauterine adenomyoma invading sigmoid mesocolon. One is extrauterine adenomyoma with multiple extrauterine leiomyoma , the other is extrauterine adenomyoma accompanying multiple myomas . We report them with review of the literature.