Lithium-induced Ebstein's Anomaly

Ebstein's anomaly (EA) is a rare congenital cardiac defect that occurs when the tricuspid valve leaflets fail to delaminate from the ventricular myocardium, they adhere to the underlying myocardium. Multiple etiologies such as genetic mutation in NKX2-5, family history of congenital cardiac anomalies, and exposure to teratogen such as lithium are associated with this rare cardiac anomaly. In our case, we present an undiagnosed adolescent male with EA who was exposed to lithium during organogenesis.