Fig. 4.

Forty-three-year-old male with locally advanced pancreatic adenocarcinoma. (A–E) Sequential coronal CT images demonstrate a replaced right hepatic artery (small arrow) arising from the superior mesenteric artery. The aberrant vessel is mildly deformed by a hypovascular mass in the pancreatic head (large arrow), suggesting tumor invasion of the vessel. This was not prospectively identified, and the patient was found at surgery to have unresectable disease due to invasion of a replaced right hepatic artery.