Rare hilar giant cystic cholangiogenic adenoma: a case report and literature review.

Laparoscopic resection of giant hilar biliary cystadenoma has been rarely documented in clinical literature. Here, we report a case of a 51-year-old female patient whose laboratory results were unremarkable, while abdominal imaging identified a large cystic lesion located in the hepatic hilum. The patient underwent laparoscopic tumor resection under general anesthesia. During surgery, the tumor was noted to significantly compress nearby hilar structures-including the portal vein and gallbladder-and had a communication with the left hepatic duct. The tumor was successfully resected en bloc, and pathological analysis confirmed it to be a hilar biliary cystadenoma. Postoperatively, the patient recovered uneventfully without any complications and was discharged in good condition. No tumor recurrence was detected at the 6-month follow-up visit. This case underscores the potential for misdiagnosis of large hilar biliary cystadenomas and shows that laparoscopic resection is a viable therapeutic option for these lesions.