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Four-chamber view of fetal hearts. (A) Normal heart. Arrow indicates interventricular septum. Arrowhead indicates interatrial septum. (B) Heart with VSD (arrow) in inlet portion of interventricular septum (arrowhead). LA, left atrium; LV, left ventricle; RA, right atrium; RV, right ventricle. Modified with permission from; Rajiah P, Mak C, Dubinksy TJ, et al. Ultrasound of fetal cardiac anomalies. AJR Am J Roentgenol 2011;197:W747–60.
