What are the principal ventricular septal defect subtypes described in fetal cardiology?

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Multiple Choice

What are the principal ventricular septal defect subtypes described in fetal cardiology?

VSDs are classified by where the defect occurs in the ventricular septum, because the location guides imaging and associated lesions. In fetal cardiology, the subtypes most consistently described as principal are perimembranous (membranous) VSDs, located in the membranous portion near the aortic valve, and subarterial (outlet) VSDs, located just beneath the semilunar valves in the outlet septum. These two locations are the classic, widely recognized categories seen on fetal echocardiography and are emphasized in standard fetal literature. Muscular and inlet VSDs are real subtypes as well, but they are not the primary pair highlighted in many fetal-focused descriptions. The other options refer to atrial septal defects (secundum, sinus venosus) rather than VSDs, so they aren’t correct for this question.

VSDs are classified by where the defect occurs in the ventricular septum, because the location guides imaging and associated lesions. In fetal cardiology, the subtypes most consistently described as principal are perimembranous (membranous) VSDs, located in the membranous portion near the aortic valve, and subarterial (outlet) VSDs, located just beneath the semilunar valves in the outlet septum. These two locations are the classic, widely recognized categories seen on fetal echocardiography and are emphasized in standard fetal literature.

Muscular and inlet VSDs are real subtypes as well, but they are not the primary pair highlighted in many fetal-focused descriptions. The other options refer to atrial septal defects (secundum, sinus venosus) rather than VSDs, so they aren’t correct for this question.

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