Hepatic Cyst

KEY FACTS

Terminology

  • Benign, congenital or developmental, fluid-filled space with wall derived from biliary endothelium

Imaging

  • Anechoic lesion with posterior acoustic enhancement, well-defined back wall, and no internal vascularity

  • May be unilocular or multilocular with barely perceptible septations

  • Ultrasound

    • Often demonstrates septations to better advantage than CT or MR

  • Current theory

    • True hepatic cysts arise from hamartomatous tissue

  • When > 10 in number, consider fibropolycystic diseases

    • Autosomal dominant polycystic liver disease

    • Autosomal dominant polycystic kidney disease

    • Biliary hamartomas

Top Differential Diagnoses

  • Biliary cystadenoma/cystadenocarcinoma

  • Cystic metastases

  • Pyogenic abscess

  • Echinococcal/hydatid cyst

  • Biloma

Pathology

  • Lined by single layer of cuboidal bile duct epithelium

  • Surrounding thin rim of fibrous stroma

Scanning Tips

  • Examine with color or power Doppler to exclude pseudoaneurysm, which can have similar appearance on grayscale imaging

  • High-frequency linear transducers with coded harmonic imaging setting can help to demonstrate cystic nature of anterior hepatic cysts

Longitudinal oblique grayscale US of the liver shows a cyst adjacent to the portal vein . The cyst is anechoic with a well-defined back wall and posterior acoustic enhancement .

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Nov 9, 2024 | Posted by in ULTRASONOGRAPHY | Comments Off on Hepatic Cyst

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