Tetralogy of Fallot is the most common cyanotic heart disease in children over the age of one, accounting for about 10 percent of all congenital heart diseases. Tetralogy of Fallot includes four anatomical abnormalities: a ventricular septal defect, right ventricular outflow tract obstruction, an overriding aorta, and right ventricular hypertrophy. In patients diagnosed through X-ray, the heart size is often within normal limits, typically appearing boot-shaped, with markedly reduced pulmonary vascular markings. The aortic arch may be located on the right side, and the ascending aorta is usually dilated. Patients with rich collateral circulation display prominent pulmonary markings.