Definition: A malignant neoplasm of the ovary (counterpart of seminoma of the testis), composed of undifferentiated gonadal germinal cells and occurring more frequently in patients younger than 20 years of age. The neoplasms are grayish yellow and firm, contain foci of necrosis and hemorrhage, and tend to be encapsulated; characteristically, they spread by way of lymphatic vessels, but widespread metastases also occur.
[dys- + L. germen, a bud or sprout, + G. -oma, tumor]
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