Sack of marbles sign (dermoid cyst)

The sack of marbles sign refers to aggregations of multiple small globules of fat within a cyst mimicking marble spheres within a sack. They appear hyperechoic on ultrasound, fat attenuation on CT, and high signal on T1WI and T2WI on MRI. It is considered highly suggestive of a dermoid cyst1.

Inspired signs
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Article information

rID: 56924
System: Head & Neck
Section: Signs
Synonyms or Alternate Spellings:

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