Cholangiocarcinoma developed in a patient with IgG4-related disease

Figure 1 Radiologic findings. A: Enhanced computed tomography showing diffuse enlargement of the pancreas with capsule-like rim and segmental wall thickening and enlargement of the lower common bile duct (CBD); B: Magnetic resonance imaging revealing narrowed main pancreatic duct and narrowed lower CBD; C: Endoscopic retrograde cholangiopancreatography showing narrowed lower CBD; D: Enhanced computed tomography (CT) showing that swelling and capsule-like rim of pancreas disappeared after corticosteroid treatment; E: Magnetic resonance imaging showing that stenosis of bile duct disappeared after corticosteroid treatment; F: CT scan showing segmental wall thickening with enhancement of the middle CBD; G: MRI revealing stenosis of the middle CBD.