Biliary hamartomas

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[edit] Discussion

  • Biliary hamartomas are also known as biliary microhamartomas or von Meyenburg complex.
  • Benign liver malformations consisting of focal disorderly collections of bile ducts, lined with a single layer of low columnar, cuboidal, or flattened epithelium, surrounded by abundant fibrous stroma.
  • The bile ducts within the lesions are of varying caliber, ranging from narrow to ectatic.
  • May occur as either isolated or multiple lesions.
  • These lesions are often discovered incidentally, and if the patient has a primary neoplasm they can be mistaken for metastatic disease.

[edit] Imaging Findings

  • Biliary hamartomas are typically multiple round or irregular focal lesions of nearly uniform size (up to 15 mm) scattered throughout the liver.

[edit] CT

  • Biliary hamartomas are hypoattenuating at CT

[edit] MRI

  • Biliary hamartomas are hypointense at T1-weighted MR imaging and hyperintense at T2-weighted imaging.
  • If the echo time is increased at T2-weighted imaging, the signal intensity of these lesions increases further and approaches that of cerebrospinal fluid.
  • Biliary hamartomas do not usually show contrast enhancement, although a peripheral enhancing rim has been described. This has been hypothesized as related to compressed surrounding normal liver parenchyma.

[edit] Images

Patient #1: Biliary hamartomas

[edit] See Also

[edit] External Links

[edit] References