Agenesis: Lack of development. For example, agenesis of a toe means the toe failed to form.
- Agency for Toxic Substances and Disease Registry
Agency for Toxic Substances and Disease Registry: An agency of the U.S. Department of Health and Human Services under the Public Health Service that works with states and other federal agencies to prevent exposure to hazardous substances from waste sites. The agency conducts public health assessments, health studies, surveillance activities, and health education training in […]
- Agenesis of the corpus callosum
Agenesis of the corpus callosum: A congenital abnormality (a birth defect) in which there is partial or complete absence (agenesis) of the corpus callosum, the area of the brain which connects the two cerebral hemispheres (the two halves of the brain). Agenesis of the corpus callosum can occur as a severe syndrome in infancy or […]
- Agenesis of the gallbladder
Agenesis of the gallbladder: A condition in which the gallbladder fails to develop. It occurs in 1 in about every 1,000 people, usually without additional birth defects.
- Agenesis, sacral
Agenesis, sacral: Failure of formation of all or part of the sacrum (the lowest section of the spine). Currarino syndrome is a condition characterized by the combination of: Partial absence of the sacrum (the lowest portion of spine), Anorectal (anal and rectal) abnormalities, and An abnormal mass in front of the sacrum (due to a […]
- Agent Orange
Agent Orange: An herbicide and defoliant containing 2,4-D and 2,4,5-T and trace amounts of dioxin. Agent Orange was used as a defoliant in the Vietnam War. Agent Orange is a carcinogen and teratogen (cause cancer and birth defects). The Institute of Medicine of the National Academies in the US has found “sufficient evidence” of an […]