Tram-track sign (orbit)

Tram-track sign refers to the parallel thickening and enhancement around the optic nerve, and is most frequently seen in the setting of optic nerve meningioma. It may, however, also be seen in 1:

It is helpful in distinguishing dural diseases from optic nerve glioma. However, it should be noted that in some cases the nerve sheath can be diffusely thickened and therefore mimicking the appearance of a optic nerve meningioma 2

It should not be confused with other tram-track signs elsewhere in the body. 

Article information

rID: 6667
Section: Signs
Synonyms or Alternate Spellings:
  • Tram track sign (orbit)

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Cases and figures

  • Figure 1: tram-tracks
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  • Case 1: optic nerve meningioma
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