Which congenital abnormality is characterized by a displaced tricuspid valve?

Ebstein's anomaly is characterized by a malformation of the tricuspid valve, leading to its abnormal positioning lower than usual in the right ventricle. In this condition, the tricuspid valve leaflets are malformed, often resulting in a valve that is enlarged and tethered to the right ventricle wall, which is typically seen in imaging studies like echocardiography. This displacement is significant because it alters the normal flow of blood between the right atrium and right ventricle and can create a spectrum of symptoms due to the resulting heart dysfunction.

Other congenital abnormalities mentioned have distinct features not associated with tricuspid valve displacement. Hypoplastic left heart syndrome involves underdevelopment of the left-sided heart structures, while ventricular septal defect and atrial septal defect are related to structural openings between the heart chambers but do not involve displacement of the tricuspid valve. Thus, Ebstein's anomaly specifically stands out as the condition where the tricuspid valve is notably displaced within the right ventricle.