Rare Jejunal Large B-cell Lymphoma Mimicking a Crohn's Disease Without Terminal Ileum Involvement.

This case describes a 49-year-old man who presented with a several-month history of melena, and unintentional weight loss. Prior esophagogastroduodenoscopy and colonoscopy were unrevealing. Further evaluation with capsule endoscopy showed patchy erythematous mucosa in the jejunum creating suspicion for Crohn's Disease. Subsequent push enteroscopy found nodular and congested patchy mucosa of jejunum, and stigmata of bleeding in the proximal and mid-jejunum. Repeat colonoscopy showed a diffuse area of erythematous mucosa in the recto-sigmoid colon, and moderately congested mucosa in the ascending colon, but a normal terminal ileum. A small bowel biopsy eventually revealed large B-cell lymphoma. This is one of the first seven reported cases of small bowel lymphoma mimicking Crohn's Disease and the first to not have any ileal involvement.