teratoma

ter·a·to·ma

T0113000 (tĕr′ə-tō′mə)n. pl. ter·a·to·mas or ter·a·to·ma·ta (-mə-tə) A tumor consisting of different types of tissue, as of skin, hair, and muscle, caused by the development of independent germ cells.

ter′a·to′ma·tous (-tō′mə-təs) adj.

teratoma

(ˌtɛrəˈtəʊmə) n, pl -mata (-mətə) or -mas (Pathology) pathol a tumour or group of tumours composed of tissue foreign to the site of growth

ter•a•to•ma

(ˌtɛr əˈtoʊ mə)

n., pl. -mas, -ma•ta (-mə tə) a tumor made up of different types of tissue. [1885–90; < Greek terat-, s. of téras monster + -oma]

Thesaurus

Noun

teratoma - a tumor consisting of a mixture of tissues not normally found at that siteneoplasm, tumor, tumour - an abnormal new mass of tissue that serves no purpose

Translations

Teratoma

teratoma

[‚ter·ə′tō·mə] (medicine) A true neoplasm composed of bizarre and chaotically arranged tissues that are foreign embryologically as well as histologically to the area in which the tumor is found.

Teratoma

a neoplasm occurring in man and animals that results from the impaired embryonic development of tissues. Found mainly in children and adolescents, it is localized in the sex glands and occasionally in other organs and parts of the body. A teratoma generally consists of different types of tissue, including connective, epithelial, muscular, and neural tissue, and may include such differentiated derivatives of these tissues as teeth and hair.

The most complex teratomas in terms of composition and structure are those that have developed from early blastomeres or from primary sex cells that are totipotential, or able to develop into any type of body tissue. Teratomas that arise at later stages of embryonic development (after gastrulation) are limited in composition by the formative potential of the embryonic germ layer or organ from which the teratomas originate. Simple, relatively benign teratomas are distinguished from teratoblastomas— malignant tumors composed of tissues of embryonic structure and lacking a tendency to differentiate. Simple teratomas are also distinguished from teratoids—developmental defects that are not tumors but that may develop into tumors. Teratomas may become carcinomas or sarcomas.

REFERENCE

Klinicheskaia onkologiia detskogo vozrasta. Edited by M. V. Volkov. Moscow, 1965. (Contains bibliography.)

teratoma

[ter″ah-to´mah] a type of tumor" >germ cell tumor made up of a number of different types of tissue from one or more of the layers" >germ cell layers; it is usually found in the ovary or testis and may be either benign or malignant.malignant teratoma a solid, malignant ovarian tumor resembling a dermoid cyst but composed of immature embryonal or extraembryonal elements derived from all three germ layers.

ter·a·to·ma

(ter'ă-tō'mă), A type of germ cell tumor composed of multiple tissues, including tissues not normally found in the organ in which it arises. Teratomas occur most frequently in the ovary, where they are usually benign and form dermoid cysts; in the testis, they are usually malignant; and, uncommonly, in other sites, especially the midline of the body. Synonym(s): teratoid tumor [terato- + G. -oma, tumor]

teratoma

(tĕr′ə-tō′mə)n. pl. terato·mas or terato·mata (-mə-tə) A tumor consisting of different types of tissue, as of skin, hair, and muscle, caused by the development of independent germ cells.

ter′a·to′ma·tous (-tō′mə-təs) adj.

teratoma

A tumour derived from the multipotent cells of more than one primitive embryonic layer (ectoderm, endoderm, mesoderm), which differs in prognosis according to the organ involved and degree of maturation of the tissues; teratomas are most common in the mediastinum, ovary and testicle, but may occur in the urogenital tract and various solid organs.

ter·a·to·ma

(ter'ă-tō'mă) A neoplasm composed of multiple tissues, including tissues not normally found in the organ in which it arises. Teratomas occur most frequently in the ovary, where they are usually benign and form dermoid cysts; in the testis, where they are usually malignant; and, uncommonly, in other sites, especially the midline of the body.
Synonym(s): teratoid tumor. [terato- + G. -oma, tumor]

teratoma

A tumour formed from germ cells showing various degrees of differentiation. Most teratomas occur in the ovaries or testicles. Some teratomas are benign, some malignant.

ter·a·to·ma

(ter'ă-tō'mă) Type of germ cell tumor composed of multiple tissues, including tissues not normally found in the organ in which it arises. [terato- + G. -oma, tumor]

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REFERENCE

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Words related to teratoma

noun a tumor consisting of a mixture of tissues not normally found at that site

Related Words