teratoma

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teratoma

 [ter″ah-to´mah]
a type of germ cell tumor made up of a number of different types of tissue from one or more of the 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]
References in periodicals archive ?
Fine needle aspiration cytology showed benign cyst with squamous epithelium and keratin deposits which was suggestive of mature cystic teratoma. Retrosternal thyroid was ruled out with normal thyroid scan and thyroid function tests.
Because the formation of teratomas is thought to result from abnormal or ectopic embryogenesis from germ cells, they may have existed since fetal life and often are first discovered in individuals at a young age.
Instead, they created teratomas using undifferentiated pluripotent cells injected into an immunodeficient mouse, and found that among their many cell types, the resulting teratomas contained muscle stem cells.
Several possible complications of teratomata (torsion, rupture, malignant transformation, and other less frequent ones), some uncommon clinical presentations (autoimmune hemolytic anemia, struma ovarii with hyperthyroidism, etc.) and a variety of unusual imaging findings, can make the diagnosis of teratoma an important clinical problem.
The histology of the resected specimen had no immature cells and this led to a diagnosis of a mature teratoma of the mediastinum.
Mature cystic teratomas account for 58% of benign ovarian tumors and up to 44% of all ovarian tumors.
In contrast, we provided in vivo evidence that O-iPS cells gave rise to teratomas containing tissues derived from all three embryonic germ layers including induction of osteoblast lineage and also contributed to some tissue formation in chimera embryos, indicating that O-iPS cells are pluripotent.
Although some authors have reported elevated CEA levels in patients with malignant conversion in retroperitoneal teratomas [13, 14], the relationship is not well established.
Engert et al., "Teratomas in infancy and childhood," Medical and Pediatric Oncology, vol.
In this patient, we also did not plan on removing the teratoma before her pregnancy, because teratomas seldom have adverse effect during pregnancy.
Intracardiac teratomas represent a small percentage of primitive intracardiac tumours in children.