embryonal tumor

(redirected from embryonic tumor)

em·bry·o·nal tu·mor

, embryonic tumor
a neoplasm, usually malignant, which arises during intrauterine or early postnatal development from an organ rudiment or immature tissue; it forms immature structures characteristic of the part from which it arises, and may form other tissues as well. The term includes neuroblastoma and Wilms tumor, and is also used to include certain neoplasms presenting in later life, this usage being based on the belief that such tumors arise from embryonic rests.
See also: teratoma.
Synonym(s): embryoma

em·bry·o·nal tu·mor

, embryonic tumor (em'brē-ōn'ăl tū'mŏr, em'brē-on'ik)
A neoplasm, usually malignant, which arises during intrauterine or early postnatal development from an organ rudiment or immature tissue. It forms immature structures characteristic of the part from which it arises and may form other tissues as well. The term includes neuroblastoma and Wilms tumor and is also used to include certain neoplasms presenting in later life, this usage being based on the belief that such tumors arise from embryonic rests, which are fragments of embryonic tissue that are still present after the embryonic period.
See also: teratoma
Synonym(s): embryoma.
References in periodicals archive ?
The diagnosis of embryonic tumor can be excluded by monitoring the dynamics of decline in the alpha fetoprotein values, as it was the case in our patient.
Differential ultrasound diagnosis of cystic formation in the projection of the adrenal gland requires exclusion of the presence of cystic neuroblastoma, embryonic tumors, adrenal abscess, dual channel system with hydronephrosis of the upper renal pole, cortical renal cysts and multicystic kidney (4).
Most important differential diagnosis to infantile hemangioendothelioma is hepatoblastoma which is a malignant embryonic tumor seen in infants and children.
As patients are often young, SPPT is suggested to be an embryonic tumor [5], although this has not been proved and further studies regarding its origin are needed.
Papillary cystic and solid tumors of the pancreas: a pancreatic embryonic tumor? Studies of three cases and cumulative review of the world's literature.
(1) It has also been called a malformation, a hamartoma, and an embryonic tumor. Lymphangioma is estimated to make up 6% of all benign soft tissue tumors in persons younger than 20 years.
MORPHOLOGY: Wilms' tumor is an embryonic tumor typically composed of variable admixture of blastemal, epithelial and stromal components.
Embryonic tumors are masses arising from rudimentary or immature tissue during fetal life.
(8-9) Teratomas are embryonic tumors that are derived from two to three germinal layers.
(6.) Zimmerman LE: Verhoeff's "terato-neuroma": a critical reappraisal in light of new observations and current concepts of embryonic tumors. Trans Am Ophthalmol Soc.
Smith (2001) concurs: "Most EC cell lines show poor differentiation potential in vitro and in vivo and contribute poorly to chimeras and/or produce embryonic tumors" (p.