Fig. 2

Abdominal contrast-enhanced computed tomography: a before neoadjuvant chemotherapy and b after neoadjuvant chemotherapy. Arrowheads indicate ≤ 180° of tumor involvement with the superior mesenteric artery. a A 24-mm low-density mass was detected at the uncinate process of the pancreas. The tumor involved ≤ 180° of the circumference of the superior mesenteric vein and artery. b The tumor shrank to 19 mm in size, and the response to preoperative chemotherapy was stable disease. The classification of tumor resectability was unchanged