Aplasia (from Greek a—not; plasis—molding) is defined in general as "defective development or congenital absence of an organ or tissue." In the field of hematology, the term refers to "incomplete, retarded, or defective development, or cessation of the usual regenerative process."
- 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
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