has part has part characteristic of has modifier Hypoplastic ventricle Hypoplastic left ventricle This feature most often occurs as part of the Hypoplastic left heart syndrome (HLHS), which may comprise additional malfmorations atresia of the aortic or mitral orifice and hypoplasia of the ascending aorta. If present, the additional features should be coded with the corresponding HPO terms. Congenital malformation of the left heart abnormal hypoplastic heart anatomical entity