Obstructive Jaundice Mimicking Pancreatic Cancer: An Unusual Presentation of Autoimmune Pancreatitis

Autoimmune pancreatitis (AIP) is an uncommon variant of chronic characterized by inflammatory changes within the pancreatic tissue triggered autoimmune mechanisms. It known to mimic cancer due its similar clinical and radiological presentations. We underline a case 55-year-old male who presented with weight loss, jaundice, pruritus. Radiological imaging suggested mass, raising suspicion malignancy. However, subsequent evaluation, absence parenchymal lymphoplasmacytic cells on endoscopic ultrasound-guided biopsy, elevated serum immunoglobulin G4 level resulted in diagnosis AIP. Our emphasizes that AIP should be included differential obstructive especially when findings are inconclusive for cancer.