Adenomyomatosis is a rare benign condition characterized by epithelial proliferation and diverticular formation in the gastrointestinal tract, most commonly affecting the gallbladder. Its occurrence in the bile duct is uncommon but significant, as it can cause biliary obstruction, cholestasis, and abdominal pain-symptoms that closely mimic early-stage cholangiocarcinoma. This overlap creates diagnostic challenges and increases the risk of misdiagnosis and overtreatment, making accurate identification essential. A 54-year-old woman presented with persistent epigastric dull pain.
