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Acanthosis nigricans is a skin disorder characterized by dark, thick, velvety skin in body folds and creases.
Review Date:
7/27/2006
Achalasia is a disorder of the esophagus (the tube that carries food from the mouth to the stomach). The esophagus is less able to move food toward the stomach, and the muscle from the esophagus to the stomach does not relax as much as it needs to during swallowing. This relaxation is needed to allow food to enter the stomach.
Review Date:
5/4/2006
Achilles tendinitis is inflammation, irritation, and swelling of the Achilles tendon (the tendon that connects the muscles of the calf to the heel).
Review Date:
9/21/2006
Achondrogenesis is a rare type of dwarfism in which there is a defect in the development of bone and cartilage.
Review Date:
7/26/2007
Achondroplasia is a disorder of bone growth that causes the most common type of dwarfism.
Review Date:
10/11/2007
Acidosis is excessive acid in the body fluids.
Review Date:
11/12/2007
Acne is a skin condition characterized by whiteheads, blackheads, and inflamed red pimples or "zits."
Review Date:
10/17/2007
An acoustic neuroma is a benign, noncancerous, often slow-growing tumor of the nerve that connects the ear to the brain (8th cranial or auditory) nerve.
Review Date:
5/30/2006
Acoustic trauma is injury to the hearing mechanisms within the inner ear, caused by excessively loud noise.
Review Date:
10/20/2006
Acquired platelet function defects are diseases or conditions that cause the platelets (the blood cells essential for clotting) to not work properly. The term "acquired" means these diseases or conditions are not inherited, but rather develop independently in a person.
Review Date:
2/26/2007