Q. A 3230-g (7.1 Ib) male newborn is delivered at term to a 31-year-old mother. The prenatal period was uneventful. The mother has no medical history. Upon examination, the Apgar score is 8 at 1 minute and 9 at 5 minutes with no cyanosis. Cardiac auscultation reveals a harsh holosystolic murmur radiating all over the precordium, with maximum sound intensity over the left parasternal region. A palpable thrill is also present over the left parasternal region. Chest auscultation is clear. Which of the following is expected to be found on the echocardiography of this neonate?