INTRAORBITAL ARTERIOVENOUS MALFORMATION - CASE-REPORT

A case of intraorbital arteriovenous malformation presenting with visu al loss, exophthalmos, and chemosis of the right eye is reported. Enha nced computer tomography and magnetic resonance imaging showed extraoc ular muscle enlargement and vascular abnormality in the right retrobul bar space. Angiography revealed an abnormal intraorbital vascular stai n with an extremely dilated right ophthalmic artery. Total removal of the intraorbital contents was performed after unsuccessful endovascula r and surgical treatment of arteriovenous malformation (AVM). Histopat hological examination disclosed an AVM in the retrobulbar fatty tissue with extension into the extraocular muscles and optic nerve.