Intraductal papillary mucinous neoplasm of the intrahepatic bile duct: a case report and literature review.

Intraductal papillary mucinous neoplasm of the bile duct (IPMN-B) is a rare malignant tumor originating from the bile duct epithelium, characterized by its ability to secrete large amounts of mucin, which can lead to biliary obstruction. This paper presents a case involving a 69-year-old woman presenting with intermittent right upper abdominal pain, imaging revealed dilation of the left intrahepatic bile duct and the presence of a solid mass. We performed left lateral hepatectomy on the patient, and the postoperative pathological diagnosis was intraductal papillary tumor with associated invasive carcinoma. At the 6-month postoperative follow-up, the patient showed no signs of recurrence and was in good condition. This case underscores the high malignant potential of IPMN-B, emphasizing the importance of early surgical resection following diagnosis to achieve a favorable prognosis and improve patient outcomes.