A 6-Month-Old Boy Is Brought to the Office for a Routine

A 6-month-old boy is brought to the office for a routine checkup.  He has met all expected developmental milestones, and all of his vaccinations are up to date.  On physical examination, the patient's peripheral pulses are somewhat accentuated.  Cardiac auscultation findings at the left sternal border are given below.  What is the most likely diagnosis in this patient?

A) Endocardial cushion defect
B) Mitral valve prolapse
C) Patent ductus arteriosus
D) Williams syndrome

Correct Answer:

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