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 7 Postembolization brain MRI demonstrates Onyx filling the left cavernous sinus adjacent to the pituitary fossa on coronal (A), axial (B), and sagittal (C) T1-weighted postcontrast images. Short white arrow: LMCA; long white arrow: left cavernous sinus containing Onyx; black arrow: optic chiasm. Additional abbreviation: LMCA, left middle cerebral artery.

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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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