Autoimmune pancreatitis associated with primary sclerosing cholangitis: MRimaging findings

Autoimmune pancreatitis is a relatively rare type of chronic pancreatitis t hat may be associated with other autoimmune disorders. The imaging features of this entity may be misleading and suggest the presence of a malignant t umour. We present a case in which MR imaging allowed us to diagnose autoimm une pancreatitis associated with primary sclerosing cholangitis, which is a nother autoimmune-related disease. Typical MR characteristics of autoimmune pancreatitis include focal or diffuse enlargement of the pancreas, the abs ence of parenchymal atrophy and significant dilation proximal to the site o f stenosis, the absence of peripancreatic spread, the clear demarcation of the lesion and the presence of a peripancreatic rim.