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Fig. 4A —80-year-old man with autoimmune pancreatitis. Contrast-enhanced axial CT scans show ill-defined low-attenuation area in head of pancreas (arrows, B) with dilation of bile duct and pancreatic duct (arrowheads, A). All three readers incorrectly diagnosed pancreatic carcinoma. Note subtle low-attenuation area in cortex of left kidney (curved arrow, A), but this was not recognized by any reader.