Radiologic and endoscopic findings. (A) An ultrasonography image showing a hypoechoic mass on the pancreas. (B) A computed tomography scan showing that this mass comprises conglomerated lymph nodes. (C) Gastroscopy showing only mild nodularity without a definite mass. (D) Mucosal nodularity is highlighted by chromoendoscopy. (E, F) Coronal and cross-sectional positron emission tomography-computed tomography images indicating fluoro-2-deoxyglucose uptake.