A 67-year-old woman with asymptomatic inferolateral repolarization abnormalities and a recent episode of de novo atrial fibrillation is admitted for a CT coronary angiogram (Fig. 1).

Multipanel image showing 3D reconstruction of the coronary arteries, chest CT and PET/CT

Answer 1: Coronary artery to pulmonary artery collateral in chronic thromboembolic pulmonary hypertension.

Answer 2: Coronary artery fistula, arising from the left anterior descending artery, supplying a pulmonary sequester.

Answer 3: Coronary artery fistula, arising from the circumflex artery, supplying a residual pulmonary lesion post-tuberculosis.

Answer 4: Coronary artery fistula, arising from the circumflex artery, supplying a pulmonary neoplasm.