Abstract
A 61-year-old man was referred to our hospital with a type 2 transverse colon tumor. Endoscopic examination at our hospital showed that the type 2 tumor changed to type 0-IIa+IIc, which was not definitive diagnosis of carcinoma histologically by the biopsy specimens. Endoscopic follow up were done closely. In the follow up periods, the endoscopic findings changed from type 0-IIc to an ulcer scar. After 10 months from the first endoscopic examination, the tumor had changed to type 1, which was histologically confirmed to be poorly differentiated adenocarcinoma. We performed transeverse colon resection with lymph node dissection. The histopathological examination of the resected specimen showed poorly differentiated adenocarcinoma with lymphoid stroma. As far as we know, colorectal cancer with lymphoid stroma has only been reported in 8 cases including our case in Japan. In addition, the endoscopic findings of our case changed several times during the follow up periods.
