Anomalous Left Coronary Artery From Pulmonary Artery Masquerading as Myocarditis in an Infant: A Case Report.

Anomalous origin of the left coronary artery from the pulmonary artery (ALCAPA), or Bland-White-Garland syndrome, is a rare but life-threatening congenital cardiac defect. Its clinical presentation, particularly in infants, is often nonspecific and can be mistaken for common conditions like myocarditis or dilated cardiomyopathy. We present a case of a 1-month-old infant where the initial presentation strongly suggested viral myocarditis, but characteristic electrocardiographic findings were pivotal in leading to the correct diagnosis of ALCAPA.