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(A) Abdominal contrast-enhanced computed tomography (CT) showed a mass approximately 5.8 × 4.7 cm in size in the periampullary area. (B) The largest lymph node in the retroperitoneal space was approximately 1.0 cm in size. (C) After treatment, abdominal enhanced CT showed shrinkage of the primary lesion. (D) The largest lymph node also shrank (red arrow).
