A 7 mm VSD would be considered a moderate to large hole in the wall between the ventricular chambers. If your son is currently asymptomatic, then either the hole is partially closed by other valve tissue or an abnormal muscle bundle, or else the pressure in the lungs could be elevated. Without further information about growth, his ECG report, his oxygen level and more details about his heart on echo, I cannot give you any prognosis.
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