Absence of the breast: A rare condition wherein the normal growth of the breast or nipple never takes place and they are congenitally absent.
Absence of the breast, also called amastia, is frequently not an isolated problem. Unilateral amastia (amastia just on one side) is often associated with absence of the pectoral muscles (the muscles of the front of the chest). Bilateral amastia (with absence of both breasts) is associated in 40% of cases with multiple congenital anomalies (birth defects) involving other parts of the body as well.
Amastia can be distinguished from amazia — wherein breast tissue is absent, but the nipple is present — a condition that typically is a result of radiation or surgery.
- Abscess, perianal
Abscess, perianal: An abscess next to the anus that causes tenderness, swelling, and pain on defecation.
- Absence seizure
Absence seizure: A seizure that takes the form of a staring spell. The person suddenly seems to be “absent.” An absence seizure involves a brief loss of awareness, which can be accompanied by blinking or mouth twitching. Absence seizures have a very characteristic appearance on an electroencephalogram (EEG). Also called a petit mal seizure.
- Abse, Dannie
Abse, Dannie: British pulmonary physician and poet. Abse was born in 1923 in Cardiff, Wales to a Jewish family. He studied medicine first in Wales and then at King’s College, London. He published his first collection of poetry in 1948 and qualified as a physician in 1950. Since then he has continued to combine his […]
- Absent eye
Absent eye: Also called anophthalmia, a congenital malformation (birth defect) of the globe. Anophthalmia refers, strictly speaking, to absence of the globe and ocular tissue from the orbit. However, in most cases of anophthalmia, CT scans show some remnants of the globe, indicating they represent severe microphthalmia (small eyes). Anophthalmia/microphthalmia may involve one or both […]
- Absence of the nipple
Absence of the nipple: Medically called athelia, this is a rare condition that may occur with a number of hereditary diseases or chromosomal defects, such as Poland Syndrome, progeria (premature aging), ectodermal dysplasia, and Yunis-Varon syndrome. Athelia tends to occurs on one side (unilaterally) in children with the Poland sequence and on both sides (bilaterally) […]