Missed our latest free live-stream? Catch up now on our Procedure Tips (Chris Nicholas) and Right Lower Quadrant Pain (Matt Morgan)

Doughnut sign (orbit)

Dr Daniel J Bell et al.

The doughnut sign of optic nerve sheath meningioma refers to the appearance of this tumor on coronal CT/MRI. The meningioma forms a thick cuff of enhancing tumor around the central non-enhancing optic nerve, mimicking the appearance of a ring doughnut. It is the coronal equivalent of the tram-track sign.

Neither the tram-track sign, nor - by extension - the doughnut sign appearance of the optic nerve, are by any means pathognomonic 2

Other described causes of this sign include 2,3:

History and etymology

The doughnut sign of optic nerve sheath meningioma was first described, on CT, in 1983 1.

See also

Inspired signs

Article information

rID: 76728
Section: Signs
Tag: cases
Synonyms or Alternate Spellings:
  • Donut sign of optic nerve sheath meningioma
  • Doughnut sign of optic nerve sheath meningioma
  • Donut sign (orbit)

ADVERTISEMENT: Supporters see fewer/no ads

Updating… Please wait.

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

 Thank you for updating your details.