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Bile duct adenoma (BDA) is a benign epithelial lesion composed of a proliferation of small, normal-looking bile ducts. ICD-O coding 8160/0 Bile duct adenoma ICD-11 coding 2E92.7 & XH6KR6 Benign neoplasm of liver or intrahepatic bile ducts & Bile duct adenoma Related terminology Acceptable: peribiliary gland hamartoma. Subtype(s) None Localization BDA is most commonly a solitary subcapsular nodule (90%), involving either liver lobe. Clinical features BDA is frequently an incidental finding at surgery or autopsy. It is mostly found in patients aged 20–70 years (range: 1.5–99 years; mean: 55 years), with no specific sex predilection. Epidemiology The frequency of BDA was 0.6% in a large autopsy study { 205188 } and 2.4% in a large resection cohort { 25329860 }. Etiology Unknown Pathogenesis The origin and pathogenesis of BDA are controversial. Early investigators proposed that BDA is a reactive process to a focal injury, possibly postinflammatory or traumatic { 3046396 }. A later study su

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