ArticleAbdominal radiology (New York)2026
Mucinous cystic neoplasm of the liver with biliary prolapse mimicking intraductal papillary neoplasm of the bile duct: a case report.
Article in Abdominal radiology (New York), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Mucinous cystic neoplasm of the liver (MCN-L) is a rare cyst-forming epithelial neoplasm that typically lacks bile duct communication. Intraductal protrusion is uncommon and can mimic cystic intraductal papillary neoplasm of the bile duct (IPNB). A 39-year-old woman undergoing fertility treatment presented with recurrent hyperbilirubinemia and predominantly cholestatic liver test abnormalities. MRI demonstrated a 10.5-cm multilocular cystic lesion in segment 4 of the liver with downstream biliary dilatation, and internal septa were visible within the dilated bile duct on T2-weighted single-shot fast spin-echo (SSFSE) images. Contrast-enhanced computed tomography (CT) revealed enhanced cyst wall and septa, while endoscopic retrograde cholangiography revealed a smooth, oval-shaped filling defect. Endoscopic and intraductal ultrasonography indicated septate cystic components of the bile duct, and biopsy revealed mucin-producing columnar epithelium overlying the ovarian-like stroma, confirming MCN. The patient was treated via extended left hepatectomy with extrahepatic bile duct resection and reconstruction. Pathological examination revealed low-grade intraepithelial neoplasia. The patient remained recurrence-free for 20 months. This case suggests that, although biliary communication usually favors cystic IPNB over MCN-L, identification of intraductal extension of the cyst wall or septa within the dilated bile duct may provide an important clue to the diagnosis of MCN-L.
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