A 40-year-old woman, with no medical history or medications, visited our hospital with chest discomfort in the morning. An electrocardiogram showed sinus rhythm without any ST changes. Transthoracic echocardiography showed an enlarged vessel that went into the left ventricle (Fig. 1, Movies 1-6). Coronary angiography and coronary computed tomography revealed an aneurysmal left coronary artery from the main trunk to circumflex that was continuous to the left ventricle at the basal posteroinferior wall (Figs. 2-4). The artery was expanded to a maximum diameter of 17 mm. Coronary steal phenomenon was excluded by exercise myocardial scintigraphy. Her symptoms improved with vasodilators, and we diagnosed her with coronary spastic angina.
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