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Ultrasonographic images of fetuses with a normal heart at 13 weeks of gestation. (A) Four-chamber view. (B) Three-vessel view. (C) Left ventricular outflow tract view. Lt, left; Rt, right; LA, left atrium; RA, right atrium; LV, left ventricle; RV, right ventricle; MPA, main pulmonary artery; Ao, aorta; SVC, superior vena cava.
