Tetralogy of Fallot in three siblings: a familial study and review of the literature.

We report a family in which three out of four siblings had tetralogy of Fallot (TOF). The family history showed TOF in the daughter of a maternal cousin, while no other congenital heart diseases were discovered. Although no teratogenic environmental agent was discovered, the absence of parental consanguinity and the presence of another affected relative suggest multifactorial inheritance. Autosomal recessive inheritance cannot be ruled out.