Abstract
An 80-year-old woman hospitalized for dizziness underwent pelvic CT scan, because bloody mucinous attachment was recognized on her under wear. Pelvic CT showed multi concentric ring sign around a mass at the lower rectum. We suspected that the mass might cause intussusception. The irregular tumor was palpable at the 3cm oral side from the anal verge. Barium enema visualized the tumor as hay-fork sign at first, but the appearance changed into apple core sign as the tumor was elevated and intussusception was reduced by inflation. Colonofiberscopy visualized the type 2 tumor near the anal verge, and it moved to the 7cm oral side from the anal verge by inflating the rectum. Biopsy revealed group V (well differentiated adenocarcinoma). Low anterior resection was performed under a diagnosis of rectal cancer with intussusception. Upon laparotomy, we saw that intussusception had been reduced.
Intussusception caused by rectal cancer is very rare. We reviewed seven cases of adult intussusception or rectal prolapse caused by rectal cancer previously reported in the Japanese literature, with some bibliographical comments.
