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A patient was referred for endoscopic ultrasound (EUS) for preoperative staging of what was believed to be pancreatic cancer, based on minimal findings on computed tomography (CT) and highly elevated CA19-9. EUS imaged a normal pancreas, but a tumor mass was identified in the gallbladder, and proven to be adenocarcinoma using EUS-guided fine-needle aspiration (FNA). Open cholecystectomy was curative...