抄録
Rectal cancer typically exhibits an intraluminal growth, but some cases show extramural growth and make it difficult to differentiate from other pelvic tumors. A case is extramural growth-type rectal cancer located in the vagina. The patient was 74 years. CT revealed a 12cm pelvic tumor and lymphadenopathy. Gynecological examination showed a tumor throughout the vagina. Cytology suggested squamous cell carcinoma. Cervical cancer was suspected. MRI showed a normal cervix and vaginal tumor with rectal invasion. Vaginal cancer or rectovaginal septum tumor was suspected from the MR images. Histological diagnosis confirmed intestinal-type adenocarcinoma, indicating rectal cancer with vaginal invasion. Re-evaluation of MRI images showed hemorrhagic necrosis in the vaginal tumor, whereas the rectal wall tumor had consistent signals with common rectal cancer, suggesting an original tumor. Determining the primary site of extramural growth-type rectal cancer can be difficult, but MRI-based internal characterization of the tumor can facilitate diagnosis.
