Introduction. Malignant tumours of ovary germ epithelium are very rare and account for about 2-5% of all ovarian tumours of germ origin. In adolescent patients under 20 years of age diagnosed to have ovarian tumour, these tumours originate from germ cells in about 70% of cases. Depending on the stage of the disease, medical treatment and age, the death rate ranges from 25% to 84%. A special group of germ tumours are mixed germ cells tumours built of two or more different types of germ tumours. Case report. This paper gives a diagnostic-therapeutic procedure and the clinical picture with the course and outcome of the decease in a nineteen-year old patient with a mixed malignant germ tumour (dysgerminoma, choriocarcinoma, immature teratoma) found in one of the ovaries. It also deals with the appearance and development, some characteristics and histological build of the tumours diagnosed in this case. Conclusion. Malignant tumours of ovary germ epithelium are very rare and develop in female population under 30 years of age. They are characterized by a high degree of malignity. They are resistant to cytostatic treatment, they spread very quickly with the lethal outcome. The course of the disease is not characteristic and is usually masked under some other acute gynaecological disease. The definitive diagnosis is made after laparotomy and pathohistological analysis of the tumour tissue.
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