leaflets are fully delaminated, and their junctional hinges retain a normal position at the atrioventricular groove The arrows highlight the flail nature of the anterior leaflet The leaflet abnormality correlates well with the severe regurgitation displayed in the corresponding color flow images to the right LA, Left atrium; LV, left ventricle; RA, right atrium; RV, right ventricle Acknowledgments The authors gratefully acknowledge David S Celermajer and John E Deanfield for their efforts in preparation of the previous editions of this chapter, Kim Feils for her editorial assistance, William D Edwards for his anatomic insights and beautiful photographic examples, and Gordon K Danielson for educating us about the anatomy, pathophysiology, and care of the patient with Ebstein malformation Annotated References Watson H Natural history of Ebstein's anomaly of tricuspid valve in childhood and adolescence: an international co-operative study of 505 cases Br Heart J 1974;36:417–427 An early review of a large number of patients with Ebstein malformation and their natural history Unique for details of the problems created by the malformation with less influence from modern medical and surgical treatments This review lacks a perspective on the neonate with Ebstein malformation because of its early date and therefore the lack of prenatal and neonatal cases Celermajer D, Bull C, Till J Ebstein's anomaly: presentation and outcome from fetus to adult J Am Coll Cardiol 1994;23:170–176 A more modern perspective on the presentations and clinical courses seen in patients with Ebstein malformation Provides a better assessment of the differences between the very young (fetus and neonate) and the older patient with Ebstein malformation Schrieber C, Cook A, Ho S, et al Morphology of Ebstein's malformation: revisitation relative to