teratoma


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Related to teratoma: Sacrococcygeal teratoma

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

/ter·a·to·ma/ (ter″ah-to´mah) pl. terato´mata, teratomas   a true neoplasm made up of different types of tissue, none of which is native to the area in which it occurs; usually found in the ovary or testis.teratom´atous
malignant teratoma 
1. a solid, malignant ovarian tumor resembling a dermoid cyst but composed of immature embryonal and/or extraembryonal elements derived from all three germ layers.

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

[ter′ətō′mə] pl. teratomas, teratomata,
a tumor composed of different kinds of tissue, none of which normally occurs together or at the site of the tumor. Teratomas are most common in the ovaries or testes.
enlarge picture
Cystic teratoma of the ovary

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]

teratoma (ter´ətō´mə),

n a tumor composed of cells capable of differentiating into any of the three primary germ layers. Teratomas in the ovary are usually benign dermoidal cysts; those in the testis are generally malignant.

teratoma

a true neoplasm made up of a number of different types of tissue, none of which is native to the area in which it occurs; usually found in the ovary or testis. See also dermoid cyst.

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.
References in periodicals archive ?
au/cancer-information/cancer-types/germ-cell-tumours/ovarian-germ-cell-tumour/) Canteen , the common symptoms of teratoma are:
Diagnostico del teratoma congenito: En la Clasificacion Internacional de las Enfermedades para Oncologia (icd-o) y la Nomencla tura Sistematizada de Medicina (snomed) los teratomas se incluyen dentro de los tumores de celulas germinales (tcg), son neoplasias derivadas de las celulas germinales primordiales que en la vida embrionaria migran desde el sistema nervioso central primitivo hasta localizarse en las gonadas (29).
7] Common combinations with ovarian tumours include mucinous cystadenoma and a combination of Brenner tumour, mature cystic teratoma, Sertoli-Leidig cell tumour may be seen.
As a result of a histopathological examination, the diagnosis of a mature cystic teratoma was confirmed and there were no other mediastinal immature or malignant tissues.
Cystic teratoma appears as a large pelvic monocular cyst with a solid nodule named Rokitansky protuberance attached to a thin wall and protrudes in the cyst lumen.
Our patient presented in a similar fashion and we understandably made a misdiagnosis of sacrococcygeal teratoma.
The finding of bilateral ovarian teratoma is also considered to be rare, since only the left ovary is usually affected (MACHADO et al.
It is essential in order to prevent recurrence which is common after multiple bilateral teratoma and although a benign tumour it needs close follow up.
The teratoma sites of predilection are the sacrococcygeal (60-65%), gonadal (10-20%), mediastinal (5-10%), presacral (5%), retroperitoneal, cervical, and rarely the intracranial regions.
Common tumor markers associated with germ cell malignancies Benign Dysgerminoma Immature Endodermal teratoma teratoma sinus tumor AFP - - +/- ++ HCG - +/- - - LDH - ++ - +/- Estradiol - +/- +/- - PLAP * - ++ - - Embryonal Nongestational tumor choriocarcinoma AFP +/- - HCG ++ ++ LDH +/- +/- Estradiol +/- - PLAP * - - ++ Present +/- Occasionally present, reported - Not present at discriminatory levels or reported outside of case reports * placental alkaline phosphatase Source: Berek & Hacker's Gynecologic Oncology, Comprehensive Gynecology, Cancer Treat Rev.
On CT scans, teratoma is frequently shown as a heterogeneous fat dense mass with calcifications.