Diffuse Large B-cell Lymphoma in a Young Patient Presenting as a Cecal Mass.

Colorectal lymphomas are very rare and are usually found in male patients between the fifth and seventh decade of life. Our patient was a 30-year-old male who presented with the complaint of epigastric pain and abdominal mass for the past three months. Physical examination was remarkable for soft solid abdominal mass extending from the right side of the abdomen toward the left side. Computed tomography showed a large lobulated mass in the right lower quadrant involving multiple loops of bowel. The mass measured 15.1 x 12.5 cm in transverse dimension and 16.2 cm in craniocaudal dimension. Colonoscopy showed a villous and fungating mass occupying the whole cecum and extending into the ascending colon. Pathology from the colonoscopy mass revealed diffuse large B-cell lymphoma, which was CD20 (cluster of differentiation 20) positive. He was started on rituximab, cyclophosphamide, doxorubicin, vincristine, and prednisone (R-CHOP) chemotherapy regimen and is following at the oncology outpatient department. A combination of surgical resection and chemotherapy is used in treating patients with colorectal lymphoma.