TY - JOUR T1 - Autoimmune pancreatitis mimicking Klatskin tumour on radiology JF - BMJ Case Reports DO - 10.1136/bcr-2014-206749 VL - 2015 SP - bcr2014206749 AU - Yousaf Bashir Hadi AU - Abdul Malik Amir Humza Sohail AU - Zishan Haider Y1 - 2015/04/09 UR - http://casereports.bmj.com/content/2015/bcr-2014-206749.abstract N2 - Autoimmune pancreatitis (AIP) is categorised into two distinct types, AIP type 1 and 2. Although there can be multisystem involvement, rarely, the cholangitis associated with AIP can present radiologically in a manner similar to that of Klatskin tumour. We present the case of a 65-year-old man who was almost misdiagnosed with a Klatskin tumour because of the similarity in radiological features of the two aforementioned clinical entities. The patient presented with a history of jaundice, pruritus and abdominal pain, and work up showed deranged liver function tests, elevated cancer antigen 19-9 levels and positive antinuclear antibodies. CT scan of the abdomen showed findings suggestive of Klatskin tumour but due to diffuse enlargement of the pancreas and surrounding low-attenuation halo found on a closer review, a diagnosis of AIP was performed. The patient was started on standard corticosteroid therapy and responded well, with complete resolution of the radiological findings. ER -