Doughnut Zeichen Orbita bei Meningeom Nervus opticus
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 .
Other described causes of this sign include :
- demyelinating optic neuritis
- sarcoidosis
- idiopathic orbital inflammation
- perioptic hematoma
- Erdheim–Chester disease
- leukemic infiltration of the optic nerve
- leptomeningeal metastases to the optic nerve
History and etymology
The doughnut sign of optic nerve sheath meningioma was first described, on CT, in 1983 .
See also
Siehe auch:
Assoziationen und Differentialdiagnosen zu Doughnut Zeichen Orbita bei Meningeom Nervus opticus:
