Fig. 2
a Gross appearance of resected rectal cancer. The resected specimen contains a polypoid tumor accompanied by an ulcer with a fungating polypoid component, measuring 48 × 46 mm. b Microscopy of the primary tumor. The primary tumor was mainly composed of moderately differentiated adenocarcinoma. c In a portion of the tumor, poorly differentiated carcinoma components were found. d Scattered lymphatic invasion was found (immunostaining by D2-40)