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©2013 UpToDate ® Print Email Atrial septal defect with pulmonary arterial hypertension The plain frontal chest radiograph in a patient with a known atrial septal defect demonstrates typical features including an enlarged right atrium and right ventricle with marked prominence of the hilar or proximal pulmonary arterial vasculature (arrows). Courtesy of Jonathan Kruskal, MD. Normal chest radiograph Posteroanterior view of a normal chest radiograph. Courtesy of Carol M Black, MD.