Rare Presentation of Eosinophilic Cholangitis in a 32-Year-Old Man.

Eosinophilic cholangitis (EC) is a rare condition characterized by eosinophilic infiltration of the bile ducts, often mimicking diseases like primary sclerosing cholangitis or cholangiocarcinoma. We report the case of a 32-year-old man with severe epigastric pain and elevated liver function tests. Initial imaging revealed common bile duct dilation and multiple strictures, initially suggestive of primary sclerosing cholangitis. Multiple endoscopic retrograde cholangiopancreatographies with brushings showed benign cytology but revealed polysomy on fluorescence in situ hybridization. A biopsy confirmed EC. High-dose corticosteroids led to significant clinical improvement. This case underscores the importance of considering EC in the differential diagnosis of biliary diseases, as timely diagnosis and treatment can lead to excellent outcomes.