Ataxia-telangiectasia: A progressive disease characterized by degeneration of the nervous system manifest by poor coordination and balance (cerebellar ataxia), red eyes due to widening of small blood vessels in the conjunctiva (ocular telangiectasia), and recurrent sinus and lung infections. Abbreviated AT. Patients with AT have a striking predisposition to leukemia and lymphoma and are extremely sensitive to radiation. Other features include difficulty swallowing and slowed growth. AT is inherited as an autosomal recessive trait.
- ATCC (American Type Culture Collection)
ATCC (American Type Culture Collection): Although little known to the general public, the American Type Culture Collection (ATCC) is a key resource for medical research. It is the world’s premier biological culture repository. The ATCC assures medical and other biological scientists a reliable source of over 60,000 authenticated, viable cultures of: Algae & Protozoa Bacteria […]
Atelectasis: Failure of full expansion of the lung at birth, or lung collapse thereafter. Also known as collapsed lung.
- Atelectasis, secondary
Atelectasis, secondary: Partial or complete collapse of a previously expanded lung. Secondary atelectasis may occur when full chest expansion is difficult, such as after chest surgery.
Athelia: Absence of the nipple. Athelia is a rare condition but it is common in certain conditions. Athelia tends to occurs on one side (unilaterally) in children with the Poland sequence and on both sides (bilaterally) in certain types of ectodermal dysplasia. The Poland sequence (named for Alfred Poland, a celebrated 19th-century British surgeon and […]
Atherogenesis: The process of forming atheromas, plaques in the inner lining (the intima) of arteries.