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[Should the contralateral testis be systematically biopsied after orchidectomy for unilateral germ cell tumour of the testis?].

Intratubular neoplasia (ITN) of the testis is a precursor of germ cell tumour, apart from spermatocytic seminoma. It is often detected in testicular tissue adjacent to germ cell tumours, but is less common in the contralateral testis. Early diagnosis of ITN by testicular biopsy would allow earlier, conservative management. However, this approach remains highly controversial except in very specific indications.