Abstract
Introduction: Distinguishing benign from malignant biliary strictures remains challenging despite diagnostic advancements. Follicular cholangitis, a rare benign condition, presents with symptoms and imaging similar to malignancies like cholangiocarcinoma, often complicating diagnosis, particularly when tumor markers are elevated and imaging suggests metastasis. Case presentation: A 57-year-old woman with hypertension and diabetes was admitted with jaundice. Elevated bilirubin and liver enzymes alongside high carbohydrate antigen 19-9 (CA19-9) levels but normal carcinoembryonic antigen (CEA) were noted. Imaging showed thickening from the hilar duct to the proximal common bile duct, accompanied by suspected lymph node metastases. Comprehensive ERCP-guided biopsies found no malignancy. Surgical resection led to a diagnosis of follicular cholangitis. Conclusions: Follicular cholangitis' long-term prognosis is elusive due to its rarity, and preoperative diagnosis is challenging. Increased awareness may improve diagnostic and treatment approaches, as this case adds to the disease's understanding.
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