Fig. 4

A Resected specimen of rectum. There was a mild stenosis in the area where the large tumor was located, but the tumor was no longer detectable. The small tumor was reduced in size, but did not disappear. B Pathological image of the large tumor before treatment. C Pathological image of the large tumor after treatment. There were cancer-free mucous nodules in the submucosa, intrinsic muscularis propria, and submucosa. The diagnosis of pCR was made