In which of the three Eisenmenger syndromes is cardiomegaly unlikely?

In which of the three Eisenmenger syndromes is cardiomegaly unlikely?

In ventricular septal defect with Eisenmenger syndrome, cardiomegaly is unlikely. Though there will be cardiomegaly initially when there is a large left to right shunt, cardiac size regresses when left to right shunt decreases as pulmonary hypertension develops. Pulmonary arteries become prominent. Aorta is not prominent in VSD Eisenmenger. In patent ductus arteriosus with Eisenmenger syndrome, ascending aorta is prominent. Cardiac size comes down in PDA with large left to right shunt when pulmonary hypertension develops.

In atrial septal defect, cardiomegaly is mainly due to the enlarged right atrium. Pulmonary arteries are prominent, while aorta is not prominent.