Abstract
The patient was a 42-year-old man with chief complaints of anal bleeding and dyschesia of three months' duration. Barium enema revealed a marked stricture at 5 to 10 cm from the anus. Endoscopically, the tumor was easily bled. By biopsy, it was confirmed to be adenocarcinoma. Examination of the resected specimen showed a protruding tumor with central excavacation of 4.5×3.5 cm in size situating at 4cm from the anus. Within the lesion surrounded by the tumor, a cobblestone like lesion was seen. Histologically, the tumor was diagnosed as tubular adenocarcinoma with the depth of pm invasion and the cobblestone-like lesion adjacent to the tumor showed characteristic changes of Crohn's disease.
