Carotid-cavernous fistula as a mimicker of myasthenia gravis.

Background: A carotid-cavernous fistula (CCF) is an abnormal communication between the carotid arterial system and the cavernous sinus. Common symptoms of CCFs include proptosis and ophthalmoplegia, but fluctuating diplopia and presence of ptosis are not typical.

Case Description: We present an unusual case of CCF with fluctuating binocular diplopia and ptosis, mimicking myasthenia gravis.