metaplasia

metaplasia
Abnormal transformation of an adult, fully differentiated tissue of one kind into a differentiated tissue of another kind; an acquired condition, in contrast to heteroplasia. SYN: metaplasis (2). [G. metaplasis, transformation]
- apocrine m. alteration of acinar epithelium of breast tissue to resemble apocrine sweat glands; seen commonly in fibrocystic disease of the breasts.
- autoparenchymatous m. m. occurring in the parenchymal cells proper to the tissue.
- Barrett m. SYN: Barrett syndrome.
- coelomic m. potential of coelomic epithelium to differentiate into several different histologic cell types.
- intestinal m. the transformation of mucosa, particularly in the stomach, into glandular mucosa resembling that of the intestines, although usually lacking villi.
- myeloid m. a syndrome characterized by anemia, enlargement of the spleen, nucleated red blood cells and immature granulocytes in the circulating blood, and conspicuous foci of extramedullary hemopoiesis in the spleen and liver; may develop in the course of polycythemia rubra vera; there is a high incidence of development of myeloid leukemia.
- primary myeloid m. myeloid m. occurring as the primary condition, often in association with myelofibrosis. SYN: agnogenic myeloid m..
- secondary myeloid m. myeloid m. occurring in individuals with another disease. SYN: symptomatic myeloid m..
- squamous m. of amnion SYN: amnion nodosum.
- symptomatic myeloid m. SYN: secondary myeloid m..

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meta·pla·sia .met-ə-'plā-zh(ē-)ə n
1) transformation of one tissue into another <\metaplasia of cartilage into bone>
2) abnormal replacement of cells of one type by cells of another

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n.
an abnormal change in the nature of a tissue. For instance, columnar epithelium lining the bronchi may be converted to squamous epithelium (squamous metaplasia): this may be an early sign of malignant change. Myeloid metaplasia is the development of bone marrow elements, normally found only within the marrow cavities of the bones, in organs such as the spleen and liver. This may occur after bone marrow failure.

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meta·pla·sia (met″ə-plaґzhə) [meta- + -plasia] the change in the type of adult cells in a tissue to another form of adult cells that are not normal for that tissue.

Metaplasia of columnar epithelium (left) to squamous epithelium (right) in a bronchus.


Medical dictionary. 2011.

Look at other dictionaries:

  • metaplasia — f. histol. Transformación de un tejido en otro de forma y funciones distintas. Medical Dictionary. 2011. metaplasia producción d …   Diccionario médico

  • metaplasia — s. f. [Medicina] Alteração de uma célula ou de um tecido em célula ou tecido de outro tipo.   ‣ Etimologia: meta + plasia …   Dicionário da Língua Portuguesa

  • metaplasia — [met΄ə plā′zhə] n. [ META + PLASIA] 1. abnormal change of one type of adult tissue to another 2. conversion of one tissue into another, as of cartilage into bone metaplastic [met΄əplas′tik] adj …   English World dictionary

  • Metaplasia — plasia Anaplasia – dedifferentiation Hyperplasia – physiological proliferation Increase in number of cells Neoplasia – abnormal proliferation Dysplasia – maturation abnormality Metaplasia – cell type conversion …   Wikipedia

  • metaplasia — n. an abnormal change in the nature of a tissue, usually in response to an environmental factor. For instance, columnar epithelium lining the bronchi may be converted to squamous epithelium (squamous metaplasia) following exposure to cigarette… …   The new mediacal dictionary

  • Metaplasia — En histología se llama metaplasia al cambio de un epitelio maduro por otro maduro que puede tener un parentesco próximo o remoto. Los fenómenos de metaplasia son completamente normales en los tejidos embrionarios que tienden naturalmente a… …   Wikipedia Español

  • Metaplasia — ► sustantivo femenino MEDICINA Transformación de un tejido vivo en otro de estructura y función diferentes. * * * En histología se llama metaplasia al cambio en las características propias de un determinado tipo celular que adopta las propias de… …   Enciclopedia Universal

  • metaplasia — metaplastic /met euh plas tik/, adj. /met euh play zheuh, zhee euh/, n. Pathol. the transformation of one type of tissue into another. [1885 90; META + PLASIA] * * * ▪ physiology       in zoology, the conversion of one type of living cell or… …   Universalium

  • Metaplasia — vienos rūšies audinio virtimas kitos rūšies audiniu statusas T sritis gyvūnų raida, augimas, ontogenezė, embriologija atitikmenys: lot. Metaplasia ryšiai: platesnis terminas – dediferenciacija sinonimas – metaplazija …   Veterinarinės anatomijos, histologijos ir embriologijos terminai

  • Metaplasia — vienos rūšies audinio virtimas kitos rūšies audiniu statusas T sritis embriologija atitikmenys: lot. Metaplasia ryšiai: platesnis terminas – dediferenciacija …   Medicininės histologijos ir embriologijos vardynas

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