Fig. 1

a Macroscopic view of the resected specimen. An intramural polypoid tumor protrudes from the incision of the lateral wall of the corpus (arrow). The cervical-endocervical canal and corpus cavity are observed to the right of the incision. An endometrial polyp is observed (arrowhead). The endometrium and endocervical mucosa are not involved. b Sagittal section of the uterus (a cross-section of the line in Fig. 1a). The arrow indicates the edge of the endometrial cavity. The yellow-white polypoid tumor appears to be situated in the cyst within the myometrial layer. The tumor invades the posterior wall of the corpus transmurally. A leiomyoma nodule is observed immediately to the left