Fig. 4

Histopathological findings on the cul-de-sac tumor. a Photograph of macroscopic findings of the extirpated cul-de-sac tumor attached to the uterus. White arrow indicates the extirpated cul-de-sac tumor. b Photograph of microscopic findings of the cul-de-sac tumor with low magnification. c Photograph of microscopic findings of the cul-de-sac tumor with high magnification. Black arrow indicates a transition from the lesion of endometriosis to the lesion of endometrial carcinoma (front formation)