Aplasia ; from Greek a, "not", "no" + plasis, "molding") 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.


1. Examples
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
Aplasia cutis congenita
Acquired pure red cell aplasia
Radial aplasia
Aplastic anemia
Germ cell aplasia, also known as Sertoli cell-only syndrome