Mantle cell lymphoma presenting as intussuscepting ascending colon mass.

Malignant lymphoma is a rare cause of gastrointestinal intussusception in adults, accounting for less than 1% of all cases of intussusception. This is a case of a South-East Asian woman in her 50s, presenting with intermittent abdominal pain, loose stools and weight loss. CT of the abdomen and pelvis showed an irregular mass causing ileocolic intussusception and she underwent emergency open right hemicolectomy with end ileostomy. Intraoperatively, her bowel was covered with lymphoma nodules, and bulky mesenteric nodules of small bowel and colon were seen. The histology shows mantle cell lymphoma, a rare subtype of B cell non-Hodgkin's lymphoma. She recovered well postoperatively and was started on chemotherapy (Nordic protocol) early.