12 August 2026
: Case report 
Syndrome of Inappropriate Antidiuresis and Symptomatic Hyponatremia After Onyx Embolization of a Carotid-Cavernous Fistula: A Case Report
Unusual or unexpected effect of treatment, Rare coexistence of disease or pathology
Amir Nikouei ABCDEF 1, Blake Giarola ACD 1, Shuo Xi CDF 2, Karl Ng
AD 2*
DOI: 10.12659/AJCR.953613
Am J Case Rep 2026; 27:e953613
Figure 2 Early opacification of the left cavernous sinus during transarterial injection of the left internal carotid artery (LICA) on anteroposterior (AP) and lateral (Lat) views. Early but less intense opacification is also evident on AP views after left external carotid artery (LECA) injection. White arrow: early filling of the left cavernous sinus on ipsilateral LICA injection; black arrow: early filling of the right cavernous sinus on LICA injection; star: fistula point. Additional abbreviations: LMCA, left middle cerebral artery; ACAs, anterior cerebral arteries; OA, ophthalmic artery.