Aplasia: Failure to develop. This is not to be confused with the word, atrophy, which means that something develops and then wastes away.

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  • Aplasia of the breast

    Aplasia of the breast: A rare condition wherein the normal growth of the breast or nipple never takes place. They are congenitally absent. There is no sign whatsoever of the breast tissue, areola or nipple. There is nothing there. Breast aplasia (also called, amastia) is frequently not alone as the only problem. Unilateral amastia (amastia […]

  • Aplastic anemia

    Aplastic anemia: Anemia due to failure of the bone marrow to produce red and white blood cells as well as platelets. Aplastic anemia frequently occurs without a known cause. Known causes include exposure to chemicals (for example, benzene, toluene in glues, insecticides, solvents), drugs (for example, chemotherapy drugs, gold, seizure medications, antibiotics), viruses (for instance, […]

  • APLS (antiphospholipid antibody syndrome)

    APLS (antiphospholipid antibody syndrome): An immune disorder characterized by the presence of abnormal antibodies in the blood associated with abnormal blood clotting, migraine headaches, recurrent pregnancy losses (repeat spontaneous abortions), and low blood platelet counts (thrombocytopenia). The abnormal antibodies are directed against phospholipids, fats that contains phosphorous. APLS can occur by itself (primary APLS) or […]

  • APM1

    APM1: Adipose most abundant gene transcript 1. (AdiPose Most abundant gene transcript 1 = APM1.) The APM1 gene encodes the hormone adiponectin.

  • Apnea, central sleep

    Apnea, central sleep: Sleep apnea is a breathing disorder characterized by brief interruptions of breathing during sleep. It owes its name to a Greek word, apnea, meaning “want of breath.” There are two types of sleep apnea: central and obstructive. Central sleep apnea occurs when the brain fails to send the appropriate signals to the […]

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