Mild tetralogy of Fallot

Here is tetralogy of Fallot. This is the most common cause of cyanotic congenital heart disease. Mild cases of tetralogy of Fallot, such as this one, allow survival into adulthood. Only the ventricular septal defect can be seen here. The full four components of the tetralogy are 1) a dextraposed aortic root overriding the aorta, 2) pulmonary stenosis, 3) ventricular septal defect, 4) an enlarged right ventricle. Pulmonic stenosis forces veinous blood through the defect into the left ventricle, causing the cyanosis.

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