2026, Number 1
Cir Card Mex 2026; 11 (1)
Coronary steal syndrome due to right coronary ostium agenesis: a case report
Calderón-Abbo, Moisés; Gómez-Peña, Fernando; Zonana-Schatz, Elías; Carrillo-Cornejo, Manuel; Lara-Calvillo, Alain L; Pérez-Bañuelos, Andrés
ABSTRACT
A single coronary artery ostium with anomalous right coronary artery (RCA) origin from collateral circulation of the left anterior descending artery is a rare variant associated with multiterritorial ST elevation myocardial infarction and high surgical complexity. We present a 54-year-old man who suffered cardiac arrest secondary to pneumonia-induced myocarditis. Cardiac Computed Tomography Angiography (CCTA) revealed a 2.6 mm LAD-RCA fistula. Stress testing showed anterior ischemia with steal syndrome, and coronary angiography confirmed the anomaly. The patient underwent successful RCA revascularization.