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Atresia of the left coronary artery ostium is extremely rare. We report the case of a 13-year-old boy who played volleyball in school and collapsed with severe chest pain during practice. He was referred to our hospital, and imaging modalities showed atresia of the left main coronary artery ostium. Urgent coronary ostioplasty was performed using a patch of 0.6% glutaraldehyde-treated autologous pericardium. His postoperative course was uneventful, and he has had a normal everyday life without chest pain 8 months postoperatively. Physicians should be aware of the patient's history, as in this case, because prompt imaging diagnosis is essential when there is a high likelihood that the event is related to myocardial ischemia. Since long-term outcome is uncertain even after successful surgical revascularization, close follow-up is required.

BackgroundNon-bacterial thrombotic endocarditis (NBTE) is an uncommon pathological situation, which involves the presence of bland, fibrin-platelet thrombi. It usually occurs at the endocardium of cardiac valves, in association with endothelial injury and a hypercoagulative state. However, NBTE on the endocardium at the right atrial free wall in a patient without any apparent hypercoagulative background is rarely reported.Case presentationA girl aged 4 years with severe pectus excavatum was referred to our hospital for treatment of a recurrent right atrial tumor. The tumor was removed concomitant with pectus excavatum repair. The tumor was revealed as recurrent thrombus. Pathological findings showed that NBTE caused by an operative scar on the endocardium of the right atrium and sustained rheological stress in the right atrium due to compression from pectus excavatum lead to recurrent thrombus formation. Three years after the discontinuation of anticoagulation therapy, no sign of thrombus formation was found.ConclusionsTo our knowledge, this is the first report of NBTE related to an interaction between sustained rheological stress from cardiac compression and endocardial injury. In such patients, we recommend concomitant chest wall repair when the operative scar is present at the site of the rheological force.