Abstract
A carotid cavernous fistula is an abnormal connection between the carotid artery and cavernous sinus which is a rare and sight threatening complication of craniofacial trauma. We report a case of a 36-year-old man with history of road traffic accident, flail chest, on mechanical ventilation who developed redness and progressive swelling of right eye. On evaluation, he was found to have right-sided conjunctival chemosis, pulsatile proptosis, and loud bruit on auscultation over right eyeball. Non-contrast computed tomography revealed multiple skull bone fractures with prominence of right-sided cavernous sinus and superior ophthalmic vein. Contrast enhanced magnetic resonance imaging with angiography revealed bulky cavernous sinus with tortuous right superior ophthalmic vein suggestive of right carotid cavernous fistula. Carotid cavernous fistula should be considered as a differential diagnosis for a critically ill patient with history of trauma developing swollen red eyes as the typical signs and symptoms cannot be assessed in patients on mechanical ventilation. The timely diagnosis and prompt treatment can save vision and can improve the outcome.
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