SummaryA consideration of the radiological contribution to the diagnosis and management of the three common forms of cyanotic congenital heart disease is presented.The infant with tetralogy of Fallot or pulmonary atresia with ventricular septal defect is usually studied before palliative surgery is undertaken. The site of obstruction to pulmonary blood flow and the presence of suitable pulmonary arteries to receive an anastomosis must be established. In the older patient presenting for repair detailed assessment of the intracardiac anatomy as well as the sites of obstruction and routes of filling of the pulmonary arteries is desiiable. Some variations of the anatomy of ventricular septal defect in tetralogy of Fallot are described.Following a brief consideration of the relationship of straightforward transposition of the great vessels to the normal state and to the partial transposition complexes, the radiological assessment of the neonatal infant with transposition is presented. The diagnosis of transposition, the state of the interventricular septum, and the state of the ductus arteriosus must be established and sometimes pulmonary stenosis excluded to assist in the selection of
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