Tetralogy of fallot in Down syndrome [Trisomy 21] - an uncommon association

Down Syndrome [trisomy 21] is the common disorder among chromosomal anomalies. This is frequently associated with congenital acyanotic heart disease. Tetralogy of fallot is an uncommon event in the trisomy 21. Tetralogy of fallot presents with cyanosis usually in the later part of infancy, but cyanosis is present since birth if Tetralogy of Fallot is accompanied with Down Syndrome