Canadian Medical Guide > Diseases > Neoplasms > Neoplasms by Histologic Type > Neoplasms, Germ Cell and Embryonal > Germinoma > Dysgerminoma Terms and Definitions




Dysgerminoma

Medical Definition: A malignant ovarian neoplasm, thought to be derived from primordial germ cells of the sexually undifferentiated embryonic gonad. It is the counterpart of the classical seminoma of the testis, to which it is both grossly and histologically identical. Dysgerminomas comprise 16% of all germ cell tumors but are rare before the age of 10, although nearly 50% occur before the age of 20. They are generally considered of low-grade malignancy but may spread if the tumor extends through its capsule and involves lymph nodes or blood vessels. (Dorland, 27th ed; DeVita Jr et al., Cancer: Principles & Practice of Oncology, 3d ed, p1646)
Guide Notes: /blood supply /chem /second /secret /ultrastruct permitted; coord IM with probably OVARIAN NEOPLASMS (IM)
Dysgerminoma Categories.
Canadian Medical Guide Definition Gonadoblastoma - A DYSGERMINOMA that contains all gonadal elements - germ cells, sex cord derivatives, and stromal derivatives. It occurs almost exclusively in abnormal gonads, most often associated with some form of gonadal dysgenesis, frequently associated with abnormal chromosomal karyotype. It is rare and occurs almost exclusively during the first two decades of life. Almost 33% are associated with germinomas. Gonadoblastomas consist of large germ cells surrounded by smaller round, darkly staining Sertoli cells, forming microfollicles consisting of hyaline bodies and calcium deposits. (Dorland, 27th ed; DeVita Jr et al., Cancer: Principles & Practice of Oncology, 3d ed, p1643)

Dysgerminoma Medical Definitions and Terms

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