Duplication of the tricuspid valve with Ebstein anomaly.

Duplication of the tricuspid valve is a rare congenital cardiac anomaly. We experienced one infant case with Ebstein anomaly, who died at seven months of age. At autopsy, the clinical diagnosis was confirmed, and also the patient was found to have double tricuspid valve orifices, each of which were accompanied by subvalvular tension apparatuses. Tricuspid valve leaflets seen in Ebstein anomaly are known to have fenestrations as accessory orifices for some instances, but this case is unique and interesting in that each valve orifice has well-developed chordae tendinae and papillary muscles below it.