Fig. 4

Intraoperative photographs. A The tumor was yellow and approximately size of an adult’s head. B We dissected of the transverse mesocolon (dotted white circle) and ligated drainage vein (black arrows) at the site where it flows into the transverse mesocolon. C We identified the feeding artery at the lower border of the pancreas (white arrows). D, E (Schema): after tumor resection, we clarified the relationship between the feeding artery (white arrows) and other vessels. We also removed the portion of the pancreatic capsule and the transverse mesocolon attached to the tumor, which were considered to be the origin of the tumor (dotted black circle). RGEV right gastroepiploic vein, DPA dorsal pancreatic artery, AcRCV accessary right colic vein, MCA middle colic artery, MCV middle colic vein