Syndrome of Inappropriate Antidiuresis and Symptomatic Hyponatremia After Onyx Embolization of a Carotid-Cavernous Fistula: A Case Report

Amir Nikouei; Blake Giarola; Shuo Xi; Karl Ng

doi:10.12659/AJCR.953613

12 August 2026 : Case report Australia

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

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Figure 4 Transvenous injection at the fistula point demonstrates opacification of the left cavernous sinus on anteroposterior (AP) and lateral (Lat) views. White arrow: early filling of the left cavernous sinus on ipsilateral transvenous injection; black arrow: early filling of the right cavernous sinus on left-sided transvenous injection; star: fistula point.

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Syndrome of Inappropriate Antidiuresis and Symptomatic Hyponatremia After Onyx Embolization of a Carotid-Cavernous Fistula: A Case Report

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