Spontaneous Thrombosis of a Left Circumflex Artery Fistula Draining Into the Coronary Sinus

Area of Science:

• Cardiology
• Interventional Cardiology
• Vascular Biology

Background:

• Coronary artery fistulas are uncommon congenital or acquired abnormalities.
• Left circumflex artery fistulas to the coronary sinus are rare, potentially leading to myocardial infarction.
• Spontaneous resolution of coronary artery fistulas is exceptionally rare.

Observation:

• A 28-year-old woman presented with acute inferoposterior ST-segment elevation myocardial infarction.
• Cardiac catheterization identified a large, ectatic left circumflex artery with a fistula to the coronary sinus.
• The patient had no prior history of cardiac anomalies or interventions.

Findings:

• Follow-up angiography demonstrated spontaneous thrombosis and occlusion of the coronary artery fistula.
• The fistula was no longer patent, indicating complete resolution.
• No surgical or interventional treatment was required for the fistula.

Implications:

• This case highlights the possibility of spontaneous resolution of coronary artery fistulas, even in the presence of myocardial infarction.
• It suggests that conservative management may be considered in select cases of coronary artery fistulas.
• Further research is needed to understand the mechanisms and predictors of spontaneous fistula thrombosis.