May Be Caused by

 Common

Arteriovenous malformation

Atherosclerosis

Hemangioma

Old trauma

Optic nerve sheath meningioma

Varices with phleboliths

 Uncommon

Dermoid

Hypercalcemia

Infiltrating retinoblastoma

Lacrimal gland neoplasm

Neuroblastoma

Neurofibroma

Optic glioma