Authors report a case of mixed gonadal dysgenesis with a karyotype containing an isodicentric Y chromosome in mosaic form, which was diagnosed in an infant. They emphasize the necessity of special investigations of newborns with perineoscrotal hypospadias and bilateral or unilateral maldescent testes, immediately after birth. The result of accurate evaluation provides correct sex assignment and the prevention of neoplastic transformation of the dysgenetic gonad.
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