Coronary artery fistulas to the coronary sinus are very rare coronary anomalies most often resulting in extreme dilatation of the donor coronary artery and the receiving vessel. However, despite common impressive appearance, their clinical and functional impact may be extremely various from asymptomatic and benign cases to disabling and life threatening situations. To adequately stratify the inherent risks and to plan the most appropriate therapeutic strategy, an overall investigation is necessary. We herein report the case of a 56year-old woman with a giant right coronary artery related to a small and restrictive fistula to the coronary sinus that was extensively investigated by multi-imaging strategy before decision of a therapeutic abstention and long-term follow-up.
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