aplasia (redirected from segmental aplasia)

aplasia /apla·sia/ (ah-pla´zhah) lack of development of an organ or tissue.aplas´tic

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aplasia axia´lis extracortica´lis conge´nita  familial centrolobar sclerosis.

aplasia cu´tis conge´nita  localized failure of development of skin, most commonly of the scalp; the defects are usually covered by a thin translucent membrane or scar tissue, or may be raw, ulcerated, or covered by granulation tissue; usually lethal.

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a·pla·sia (-plzh)

n.

1. Congenital absence of an organ or tissue.

2. Incomplete, retarded, or defective development of an organ or tissue.

3. Cessation of the usual regenerative process in an organ or tissue.

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aplasia

[əplā′zhə]

Etymology: Gk, a, plassein, not to form

1 a developmental failure resulting in the absence of an organ or tissue.

2 (in hematology) a failure of the normal process of cell generation and development in the bone marrow. See also aplastic anemia. Compare hyperplasia, hypoplasia. aplastic, adj.

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aplasia [ah-pla´zhah]

defective development or complete absence of an organ due to failure of development of the embryonic tissues or cells. 2. a hematologic disorder in which the normal progression of cell generation and development does not occur.

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aplasia (plā´zh),

n a lack of origin or development (e.g., aplasia of dentition associated with ectodermal dysplasia).

aplasia of dentition,

n See anodontia.

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aplasia

defective development or complete absence of an organ or tissue due to failure of development.

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aplasia cutis

see epitheliogenesis imperfecta.

pure red cell aplasia

selective depression of erythropoiesis with anemia resulting.

segmental aplasia

aplasia of a segment of an organ, e.g. uterus.

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aplasia

Absence of tissue or organ development. See Pure red cell aplasia, Pure white cell aplasia. Cf Atrophy, Hypoplasia.