The most common form of cyanotic congenital heart disease. The tetralogy consists of stenosis of the pulmonary valve (see PULMONARY STENOSIS); a defect in the septum separating the two ventricles (see VENTRICLE); the AORTA over-riding both ventricles; marked HYPERTROPHY of the right ventricle. Surgery is required to remedy the defects.... tetralogy of fallot
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