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 5 Postembolization digital subtraction angiography demonstrates mixed opacification with the Onyx cast (“shadow”) on transarterial injection. Left internal carotid artery (LICA) injections, including shadow views, show residual flow around the Onyx cast. Right internal carotid artery (RICA) injections, including shadow views, similarly demonstrate partial filling adjacent to the Onyx cast. Additional abbreviations: LMCA, left middle cerebral artery; RMCA, right middle cerebral artery; ACAs, anterior cerebral arteries; LIMAX, left internal maxillary artery.