embryonal 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 AT/RT is an aggressive, malignant, embryonal tumor most commonly composed of epithelioid cells with round nuclei and prominent nucleoli with frequent mitotic figures.
Report on 11 cases of a distinctive embryonal tumor with favorable prognosis.
Medulloblastoma is a malignant embryonal tumor of the cerebellum, accounting for 14% of all pediatric central nervous system tumors, (3) and it is one of the so-called malignant small blue cell tumors bearing histological similarity to SCC.
The medulloblastoma (MDB) is defined as a malignant, invasive embryonal tumor of the cerebellum, preferentially occurring in children and adolescents, with a propensity for leptomeningeal dissemination.
39) Many of the embryonal tumors encountered in childhood have been collectively listed as "small round blue cell tumors," for which ancillary studies, such as a range of immunohistochemical staining procedures and molecular genetic analysis, enable a specific diagnosis.
Histologically, chordomas are embryonal tumors that develop from remnants of the notochord (chorda dorsalis).
NCT00867178 ("Vorinostat, Isotretinoin, and Combination Chemotherapy in Treating Young Patients Who Have Undergone Surgery for Embryonal Tumors of the Central Nervous System")
Pipeline project to identify fully human therapeutic antibody candidates for Embryonal Tumors (ET) by using its unique antibody discovery platform.
Trisomy of chromosome 20 and duplication of the long arm of chromosome 20 have been also observed in rhabdomyosarcoma, suggesting a link between these 2 embryonal tumors, both of which are also associated with losses at the Beckwith-Wiedemann syndrome locus.
Separation of such tumors from conventional glioblastoma may be worthwhile, especially given that some examples show clinical progression more akin to small cell embryonal tumors with cerebrospinal fluid dissemination.
1-6] Differentiation into specific mesenchymal tissues, such as cartilage, bone, skeletal muscle, smooth muscle, or adipose tissue in these embryonal tumors, is rare and has been reported in a few cases of medulloblastoma,[7-12] a cerebral medulloepithelioma,[13] and a case of cerebral PNET.