Aplasia

Aplasia (/əˈpleɪʒə/ (listen); from Greek a (not, no); plasis (molding)) is a birth defect, where an organ, or a tissue, is absent, or defective. Aplasia (/əˈpleɪʒə/ (listen); from Greek a (not, no); plasis (molding)) is a birth defect, where an organ, or a tissue, is absent, or defective. Aplastic anemia is the failure of the body to produce blood cells. It may occur at any time, and has multiple causes.