Pancreatic mass as an initial manifestation of polyarteritis nodosa: A case report and review of the literature

Figure 1 Preoperative images. A: An ultrasonogram showing a slightly ill-defined hypoechoic mass at the pancreatic head; B-E Abdominal CT scans: The pancreatic mass is slightly hypodense on simple CT; C: Enhanced CT shows a non-enhancing mass (arrow) located adjacent to the bile duct (arrowhead) at the arterial phase. Note that the walls of the gallbladder (asterisk) and bile duct are thickened; D and E; The mass has sporadic enhancement at the later phase; F: A Cholangiogram showing a tapered distal biliary stricture consistent with extrinsic compression by the pancreatic mass. CT: Computed tomography.