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Figure 6 Ductal angle in pulmonary atresia with intact ventricular septum. (A) Echocardiogram showing normal angle of duct to descending aorta (DAO) (>90°) in a patient with a tripartite right ventricular (RV) and membranous atresia; (B) abnormal acute angled duct (<90°) in a patient with a so-called "unipartite" RV and muscular atresia. AO = aorta; LA = left atrium.
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