In this section
In this condition, which has some similarities to Fallot's
Tetralogy, there is a VSD with narrowing at the
pulmonary valve. However the Pulmonary Valve leaflets (flaps)
are rudimentary and non functional, resulting in severe Pulmonary
Incompetence. The Pulmonary Arteries tend to be enlarged and may
cause problems by compressing and narrowing air passages in the
lungs, resulting in respiratory difficulty.