Definition:

Ebstein anomaly is a rare congenital heart abnormality, characterized by downward displacement of the tricuspid valve into the right ventricle. Displacement and malformation of the tricuspid valve is accompanied by an enlarged right atrium and a dilated, thinned right ventricle. Ebstein anomaly can occur as a sporadic or a familial defect. It has been reported that deletion 1p36 and deletion 8p23.1 are the most frequent chromosomal structural changes associated with Ebstein anomaly.