# Incidental diagnosis of intraductal papillary neoplasm of the bile duct: Imaging findings from a case report

## TL;DR

A rare bile duct tumor was diagnosed incidentally in an elderly woman through imaging, and surgical removal prevented cancer progression.

## Contribution

This case report highlights the role of imaging in diagnosing intraductal papillary neoplasm of the bile duct and confirms its low-grade subtype.

## Key findings

- Ultrasound and MRI identified a left bile duct tumor with a polypoid appearance.
- Histopathology confirmed low-grade dysplasia with a pancreaticobiliary subtype.
- Postoperative imaging showed no residual tumor and no recurrence after surgery.

## Abstract

Intraductal papillary neoplasms of the bile ducts (IPNBs) represent a rare biliary tract tumors with malignant potential, requiring surgical resection to prevent progression to cholangiocarcinoma. In this case, an 83-year-old woman with an obstructive pattern in liver function tests was incidentally found to have a solid mass in the left hepatic lobe on ultrasound. Liver MRI suggested a polypoid intraductal papillary neoplasm of the left bile duct, and histopathological analysis after surgical resection confirmed low-grade dysplasia with a pancreaticobiliary subtype. Postoperative MRI showed no residual tumor, and the patient remains under close observation with no evidence of recurrence. This case highlights the importance of imaging techniques in the early detection and characterization of IPNB, and includes a summary of its morphological subtypes.