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Figure 1: Prenatal US at 33 weeks' gestational age with red arrow showing dilation of the left ventricle directly under the mitral valve. Given echocardiogram and magnetic resonance imaging in the 1st week of life, this was likely aneurysmal dilation. The left atrial aneurysm is not visualized here or during prenatal US

Figure 1: Prenatal US at 33 weeks' gestational age with red arrow showing dilation of the left ventricle directly under the mitral valve. Given echocardiogram and magnetic resonance imaging in the 1<sup>st</sup> week of life, this was likely aneurysmal dilation. The left atrial aneurysm is not visualized here or during prenatal US