Atoll sign (liver MRI)

The atoll sign in hepatic imaging has been described when a liver lesion shows a peripheral rim of high T2 signal intensity with the center of the lesion appearing isointense to the background of non-cirrhotic liver on T2WI mimicking an atoll. It is considered a characteristic sign of an inflammatory hepatic adenoma but is only seen in about one third of cases. It probably represents dilated sinusoids within the periphery of the adenoma.

See also

Share article

Article information

rID: 39503
Section: Signs
Synonyms or Alternate Spellings:
  • Atoll sign - liver imaging

Support Radiopaedia and see fewer ads

Updating… Please wait.

 Unable to process the form. Check for errors and try again.

 Thank you for updating your details.