Optic canal enlargement
Optic canal enlargement can be caused by numerous etiologies.
Pathology
The optic canal has an average transverse diameter of 3.6 ± 0.6 mm . The optic canal can be considered enlarged when it is >6.5 mm in transverse diameter .
Etiology
- glioma of optic nerve
- meningioma of optic nerve sheath
- metastasis
- neurofibromatosis
- aneurysm of the ophthalmic artery
- carcinoma of the ethmoid or sphenoid sinus
- tuberculosis
- sarcoidosis
- increased intracranial pressure
- mucocele of sphenoid sinus
- pituitary adenoma
- craniopharyngioma extending anteriorly
- idiopathic orbital inflammation
- retinoblastoma
See also
