Testicular tumours in children have many particular traits in comparison with those in adults. These specific characteristics are: relative and absolute frequency rate of individual types of tumour, hystopathology characteristics, biological behaviour and its interdependence with the child's age, prognosis, complications as well as early and late consequences of individual treatments. Among all solid tumours in paediatric population, testicular tumours develop in 1-2 per cent of cases. As a rule, the tumour develops in one testicle, only exceptionally in both. The most fequent are the tumours of the yolk sac (47%), Leydig-cell tumours (18%), teratomas (14%), Sertoli-cell tumours (10%), and rabdomyosarcomas (4%), whereas other tumorus (lymphomas, fibrosarcomas, hemangiomas, fibromas and others) are much less frequent.
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