Tram-track sign (orbit)
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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:
- orbital pseudotumour
- perioptic neuritis
- orbital sarcoidosis
- oribtal leukemia
- orbital lymphoma
- orbital metastases
- perioptic haemorrhage
- Erdheim-Chester disease
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.
-<li><a href="/articles/orbital-pseudotumour">orbital pseudotumour</a></li>- +<li><a href="/articles/idiopathic-orbital-inflammation">orbital pseudotumour</a></li>
-<li>orbital <a href="/articles/sarcoidosis-1">sarcoidosis</a>-</li>- +<li><a title="Orbital sarcoidosis" href="/articles/sarcoidosis-orbital-manifestations-1">orbital sarcoidosis</a></li>
-</ul><p>It is helpful in distinguishing dural diseases from <a href="/articles/optic-nerve-glioma">optic nerve glioma</a>. However, it should be noted that in some cases the nerve sheath can be diffusely thickened and therefore mimicking the appearance of a <a href="/articles/optic-nerve-sheath-meningioma">optic nerve meningioma</a> <sup>2</sup>. </p><p>It should not be confused with other <a href="/articles/tram-track-sign-disambiguation-1">tram-track signs</a> elsewhere in the body. </p>- +</ul><p>It is helpful in distinguishing dural diseases from <a href="/articles/optic-pathway-glioma">optic nerve glioma</a>. However, it should be noted that in some cases the nerve sheath can be diffusely thickened and therefore mimicking the appearance of a <a href="/articles/optic-nerve-sheath-meningioma">optic nerve meningioma</a> <sup>2</sup>. </p><p>It should not be confused with other <a href="/articles/tram-track-sign-disambiguation-1">tram-track signs</a> elsewhere in the body. </p>
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