Imaging features of bile duct adenoma: case series and review of literature

Özet

PURPOSEWe aimed to evaluate the imaging features of bile duct adenoma (BDA) on ultrasonography (US),computed tomography (CT), and magnetic resonance imaging (MRI).METHODSRetrospective search in our institution database was performed for histologically confirmed BDA.Their imaging studies before histologic confirmation were reviewed. The search identified sevenadults (mean age, 52.9 years) with histologically proven single BDA each. US (n=3), CT (n=5),and MRI (n=3) were performed before histologic confirmation. Additionally, a systematic Englishliterature review for BDA and reported imaging findings since 2000 was also conducted usingthe following search criteria “bile duct adenoma, peribiliary hamartoma, biliary adenoma, CT,ultrasound, MRI” (date range: 01/01/2000 through 08/31/2016). The imaging findings of thosecases reported were summarized and compared with our series.RESULTSAll seven individual nodules were well circumscribed. Five lesions were located in the righthepatic lobe and two in the left hepatic lobe. On US, lesions appeared hypoechoic (n=2) andhyperechoic (n=1). BDA was hypodense on unenhanced CT images (n=1). On MRI, BDA werehypointense on T1 (n=3), hyperintense on T2 (n=3), and hyperintense on diffusion-weighted images(n=2). On contrast-enhanced CT and MRI, BDAs showed arterial phase hyperenhancementthat persisted on portal venous/delayed phase images.CONCLUSIONBDA demonstrates characteristic arterial phase hyperenhancement that persisted into the portalvenous and delayed phases on CT and MRI, which may be useful in differentiating from otherhepatic lesions.