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Cerebral angiogram showing a small indirect Barrow type D right carotid-cavernous fistula

Selective injection of the external carotid artery demonstrates filling of the cavernous sinus (arrow) and retrograde drainage into the right superior ophthalmic vein (arrowhead).

(Source: Thinda S, Melson MR, Kuchtey RW. Worsening angle closure glaucoma and choroidal detachments subsequent to closure of a carotid cavernous fistula. BMC Ophthalmol 2012;12:28. Creative Commons Attribution 2.0 Generic [CC BY 2.0] license, creativecommons.org/licenses/by/2.0.)