Aplasia

Aplasia (/əˈpleɪʒə/ (listen); from Greek a, "not", "no" + plasis, "formation") is a birth defect where an organ or tissue is wholly or largely absent. It is caused by a defect in a developmental process.

Aplastic anemia is the failure of the body to produce blood cells. It may occur at any time, and has multiple causes.

Examples

• Acquired pure red cell aplasia
• Aplasia cutis congenita
• Aplastic anemia
• Germ cell aplasia, also known as Sertoli cell-only syndrome
• Radial aplasia
• Thymic aplasia, which is found in DiGeorge syndrome and also occurs naturally as part of the gradual loss of function of the immune system later in life

See also

• Atrophy
• Hyperplasia
• Hypoplasia
• Neoplasia
• List of biological development disorders