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Atrial Septal Defect
Etiology: congenital — Ostium primum (30%) – at cushion, associated with AV canal — Ostium secundum (60%) – at fossa ovale — Sinus venosus (10%) – at below superior vena cava, associated with partially anomalous pulmonary venous return, see right atrial enlargement without right ventricle enlargement and collapsed aorta
Complications: Long-term untreated ASD may lead to Eisenmenger physiology seen in 6% of patients with untreated ASD
Clinical: usually present in adults
Cases of Atrial Septal Defect
CXR AP shows mildly increased pulmonary vascularity and a normal heart size.