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Dysplastic : ウィキペディア英語版
Dysplasia


Dysplasia (from Ancient Greek δυσ- ''dys-'', "bad" or "difficult" and πλάσις ''plasis'', "formation") is an ambiguous term used in pathology to refer to an abnormality of development or an epithelial anomaly of growth and differentiation (epithelial dysplasia).
The terms hip dysplasia, fibrous dysplasia, renal dysplasia refer to an abnormal development, at macroscopic or microscopical level.
Myelodysplastic syndromes, or dysplasia of blood-forming cells, show increased numbers of immature cells in the bone marrow, and a decrease in mature, functional cells in the blood.
== Epithelial dysplasia ==

Epithelial dysplasia consists of an expansion of immature cells (such as cells of the ectoderm), with a corresponding decrease in the number and location of mature cells. Dysplasia is often indicative of an early neoplastic process. The term dysplasia is typically used when the cellular abnormality is restricted to the originating tissue, as in the case of an early, ''in-situ'' neoplasm.

Dysplasia, in which cell maturation and differentiation are delayed, can be contrasted with metaplasia, in which cells of one mature, differentiated type are replaced by cells of another mature, differentiated type.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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