In which of the following conditions left atrium is not enlarged: (A) Ventricular septal defect, (B) Atrial septal defect, (C) Aoopulmonary window, (D) Patent ductus aeriosus
Answer is B. In ASD left atrium does not enlarge unless associated with other anomalies like mitral regurgitation . Ref : Ghai essential of pediatrics,eighth edition P.no: 413