yolk sac tumor

yolk sac tumor
a malignant germ cell tumor of children that represents a proliferation of both yolk sac endoderm and extraembryonic mesenchyme. It is characterized by a labyrinthine glandular pattern with a papillary projection into a sinuslike space; frequently there are hyaline bodies and Schiller-Duval bodies. It produces α-fetoprotein and most often occurs in the testes, but is also seen in the ovaries and some extragonadal sites. Called also infantile embryonal carcinoma, juvenile embryonal carcinoma, yolk sac carcinoma, orchioblastoma, and endodermal sinus t.

Medical dictionary. 2011.

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  • Yolk sac — Infobox Embryology Name = Yolk sac Latin = GraySubject = 11 GrayPage = 54 Caption = Human embryo of 2.6 mm. Caption2 = Human embryo from thirty one to thirty four days System = CarnegieStage = 5b Days = 9 Precursor = endoderm GivesRiseTo =… …   Wikipedia

  • yolk sac carcinoma — see under tumor …   Medical dictionary

  • tumor — 1. Any swelling or tumefaction. 2. SYN: neoplasm. 3. One of the four signs of inflammation (t., calor, dolor, rubor) enunciated by Celsus. [L. t., a swelling] acinar cell t. a …   Medical dictionary

  • Germ cell tumor — Classification and external resources Micrograph of a seminoma, a common germ cell tumor. ICD 10 C …   Wikipedia

  • Endodermal sinus tumor — Infobox Disease Name = Endodermal sinus tumor Caption = DiseasesDB = 4248 ICD10 = ICD9 = ICDO = 9071/3 OMIM = MedlinePlus = eMedicineSubj = eMedicineTopic = MeshID = D018240 Endodermal sinus tumor (EST), also known as yolk sac tumor (YST), is a… …   Wikipedia

  • Mediastinal germ cell tumor — Malignant mediastinal germ cell tumors of various histologies were first described as a clinical entity approximately 50 years ago.[when?] Mediastinal and other extragonadal germ cell tumors were initially thought to represent isolated metastases …   Wikipedia

  • sac — 1. A pouch or bursa. SYN: saccus [TA]. SEE ALSO: sacculus. 2. An encysted abscess at the root of a tooth. 3. The capsule of a tumor, or envelope of a cyst. [L. saccus, a …   Medical dictionary

  • endodermal sinus tumor — yolk sac t …   Medical dictionary

  • germ cell tumor — any of a group of tumors arising from primitive germ cells, usually of the testis or ovary; they range from benign to highly malignant. Types include embryonal carcinoma, germinoma, gonadoblastoma, polyembryoma, teratoma, and yolk sac or… …   Medical dictionary

  • testicular tumor — general term for any tumor of the testis; in adults these are nearly always malignant germinomas, whereas in children many are yolk sac tumors or benign varieties such as teratomas, Leydig cell tumors, or androblastomas. Called also testiculoma …   Medical dictionary

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