Spontaneous Closure of a Carotid-cavernous Fistula after Contrast-enhanced Orbit Computed Tomography

Purpose: We report a case of spontaneous closure of a carotid-cavernous fistula (CCF) after contrast-enhanced orbit computed tomography (CT).Case summary: A 80-year-old female was referred to our clinic under suspicion of chronic angle- closure glaucoma because of persistently high intraocular pressure commencing one month prior. Slit-lamp examination revealed a conjunctival injection and corkscrew-like vessel dilatation in the left eye, and a high intraocular pressure. Dilated fundus examination revealed central retinal vein occlusion in that eye. Contrast-enhanced orbit CT revealed a dilated, superior ophthalmic vein in the left orbit, and she was transferred to our department of neurosurgery for digital subtraction angiography (DSA); this is the gold standard imaging modality for the diagnosis of direct and indirect CCFs. DSA was performed two weeks after orbit CT; however, no CCF was visible. Thereafter, the conjunctival injection and the elevated intraocular pressure improved gradually over eight months. We suspect that the CCF closed spontaneously.Conclusions: Our case highlights the fact that a CCF can close spontaneously after contrast-enhanced orbit CT; ophthalmologists may wish to bear this in mind.