Helicobacter pylori serology was positive. Because of his persistent melena and profound anemia, the patient underwent esophagogastroduodenoscopy. Positron emission tomography (PET) indicated thickening along the lesser curvature of the stomach with increased fl uorodeoxyglucose (FDG) uptake. WHAT IS YOUR DIAGNOSIS? * Gastric carcinoid tumor * Hodgkin lymphoma * Extranodal marginal zone B-cell lymphoma * Gastric adenocarcinoma DISCUSSION This patient had extranodal marginal zone B-cell lymphoma (MALT), a subtype of non-Hodgkin lymphoma (NHL) that can arise in epithelial tissue.