A Cause of Rectal Mass: Diffuse Large B-Cell Lymphoma

The most commonly seen pathological type of rectal cancer is adenocarcinoma. The involvement of the colorectal tract with diffuse large B-cell lymphoma is a very rare clinical condition. A-65-year old man was admitted with complaints of weight loss and hematochezia. A rectal mass that mimicked rectal carcinoma was diagnosed by rectal examination and supported by the colonoscopy. The final report of the rectal mass biopsy reported as rectal lymphoma. Thoracoabdominal computed tomography was showed rectal wall thickening which surrounded small lymph nodes. Additional examinations didn’t reveal any evidence of infiltration to other organs. The patient diagnosed as primary rectal lymphoma and chemotherapy was started by the hematology department. Rare pathologies such as rectal lymphoma must be kept in mind in the differential diagnosis of rectal mass cases. Since both rectal carcinoma and rectal lymphoma have similar appearances in clinical and radiological studies, it is difficult to make a differential diagnosis.