title: Primary rectal lymphoma staged by magnetic resonance imaging: case report of an unusual cause of rectal bleeding.
mesh_terms: D000328:Adult; D003937:Diagnosis, Differential; D006471:Gastrointestinal Hemorrhage / Q000473:pathology*; D006801:Humans; D008228:Lymphoma, Non-Hodgkin / Q000473:pathology*; D009682:Magnetic Resonance Spectroscopy; D008297:Male; D009367:Neoplasm Staging; D012004:Rectal Neoplasms / Q000473:pathology*; D012007:Rectum / Q000473:pathology