A radiosensitive malignant neoplasm usually arising from germ cells in the testis of young male adults which metastasizes to the paraortic lymph node s; a counterpart of dysgerminoma of the ovary. [L. semen, seed (semen) + G. -oma, tumor]
- spermacytic s. a relatively slow-growing, locally invasive type of testicular s. that does not metastasize and has no ovarian counterpart.

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sem·i·no·ma .sem-i-'nō-mə n, pl -mas also -ma·ta -mət-ə a germinoma of the testis

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a malignant tumour of the testis, appearing as a swelling, often painless, in the scrotum. It tends to occur in an older age group than the teratoma. The treatment for localized disease is surgery involving removal of the testis (see orchidectomy). Secondary tumours in the lungs can be treated with chemotherapy and radiotherapy to the draining lymph nodes. A similar tumour occurs in the ovary (see dysgerminoma).

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sem·i·no·ma (sem″ĭ-noґmə) [semen + -oma] a radiosensitive, malignant neoplasm of the testis, a type of germ cell tumor thought to be derived from the sexually undifferentiated embryonic gonad; two histologic variants are recognized: classical and spermatocytic. A grossly and histologically identical neoplasm in the female is known as dysgerminoma. The term germinoma is now used to include both the male and female neoplasms. Called also spermatocytoma and spermocytoma.

Medical dictionary. 2011.

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