Myocardial infarction and atypical Kawasaki disease in a 3-month-old infant.

Diagnosing atypical Kawasaki disease (AKD) in children is often difficult and frequently delayed. As a result, children may present with life-threatening cardiovascular complications of the disease. Such complications include myocarditis, coronary artery abnormalities (eg, aneurysms), and myocardial infarction. In this report, we describe the case of a 3-month-old infant who presented to our emergency department in cardiovascular collapse. She was found to have multiple coronary artery aneurysms and a myocardial infarction and was subsequently diagnosed with AKD. This report reviews the diagnostic criteria for Kawasaki disease and AKD, common cardiovascular sequelae, and the presentation of children with these cardiovascular complications.