Fig. 4From: A case of metastatic carcinoma of anal fistula caused by implantation from rectal cancer a There is no communication with rectal lesion and the anal fistula b Histopathology indicated that the rectal lesion was a moderately differentiated adenocarcinoma (H&E ×20). c The anal fistula was found to be a moderately differentiated tubular adenocarcinoma resembling the rectal lesion (H&E ×20)Back to article page