A case report of a young woman with pulmonary emboli and a right coronary artery-to-coronary sinus fistula.

Background: Coronary artery fistulae are rare cardiovascular anomalies that can present with atypical symptomatology and therefore pose diagnostic challenges, especially in young patients.

Case Summary: A 34-year-old woman presented with left-sided pleuritic chest pain, haemoptysis, and flu-like symptoms. Initial evaluation revealed multiple left-sided pulmonary emboli, and her transthoracic echocardiography showed turbulent flow in a dilated coronary sinus. A right coronary artery (RCA) to coronary sinus fistula was confirmed by computed tomography coronary angiogram. The patient was treated with lifelong anticoagulation, and a subsequent stress cardiac magnetic resonance imaging did not show inducible myocardial ischaemia. As such, the patient was managed conservatively.

Discussion: Utilization of multi-modality imaging is of utmost importance for diagnostic and therapeutic purposes in coronary artery fistulae. In this case report, our patient presented with unprovoked pulmonary emboli, which could be caused by the turbulent flow and stasis, due to the RCA-to-coronary sinus fistula.