Congenital Malformations Registry - 1996 Report Glossary of
Terms* Agenesis Absence of part(s) of the body. Agenesis,
aplasia, or hypoplasia of the lung The absence or incomplete
development of a lung or lung tissue. Anencephaly Congenital
absence of the skull, with cerebral hemispheres completely
missing or reduced to small masses attached to the base of the
skull. Anencephaly is not compatible with life. Aniridia The
complete absence of the iris of the eye or a defect of the iris.
Can be congenital or traumatically induced. Anopthalmia A
developmental defect characterized by complete absence of the
eyes, or by the presence of vestigial eyes. Anotia A congenital
absence of one or both ears. Aortic valve stenosis A cardiac
anomaly characterized by a narrowing or stricture of the aortic
valve. This condition causes abnormal cardiac circulation and
pressure in the heart during contractions. This condition can be
repaired surgically in some cases. Atresia Imperforation;
absence or closure of a normal opening. At