Kawasaki disease: case report of a diagnostic dilemma and often a missed diagnosis

Abstract Background Management of cardiovascular sequelae to Kawasaki disease (KD) is challenging to adult cardiologists. Vasculitis of medium-sized arteries especially coronary arteries often leads to focal intimal thickening and aneurysmal dilatation of one or more coronary arteries. It needs special attention to recognize coronary artery involvement because of potential long-term morbidity and mortality. We present a case of diagnostic dilemma in young adult Chinese male with KD. Case summary This asymptomatic patient was found to have deep Q waves in anterior leads on screening electrocardiography and was thought to have myocarditis after depiction of wall motion abnormality on echocardiography, later to be confirmed to have left anterior descending artery (LAD) territory infarct on cardiac magnetic resonance imaging. Coronary computed tomography angiogram depicted proximal LAD aneurysm with calcified plaque/thrombus. Additionally, there was an 18 mm giant right coronary artery (RCA) aneurysm with braid-like appearance and soft plaque (mural thrombus). His previous medical history included fever and cervical lymphadenopathy. Because of the high risk he was commenced on long-term low-dose aspirin and β-adrenergic-blocking agent to reduce myocardial oxygen consumption; however, 3 years later, he presented to the emergency department with acute inferior myocardial infarction. He was noted to have total occlusion of the proximal RCA and was treated aggressively with thrombectomy and percutaneous balloon angioplasty followed by medical management with β-blockers, sacubitril/valsartan, clopidogrel, and rivaroxaban without subsequent adverse cardiovascular events. Discussion Kawasaki disease is one of the main causes of coronary artery disease in young adults and can be easily overlooked.