Here we report the discovery of an extramedullary ileocecal plasmacytoma, a rare entity reported only ～60 times in the literature. This finding occurred during management of a patient who had sustained an occult perforation during diagnostic colonoscopy. We explored the patient finding a large ileocecal perforation, and thus a right hemicolectomy was performed. Interestingly, the pathology of the mass was consistent with an extramedullary plasmacytoma, which is a very rare gastrointestinal diagnosis. We end by summarizing the presentation and work-up of extramedullary plasmacytoma.
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