[Leydig's cell tumor with endocrine syndrome: presentation of a case and review of the literature].

We present a case of Leydig's cell tumour in a young adult, with endocrinal manifestation. The relative rarity of these neoplasias. The opposition of their clinical manifestations, virilizing in the child and feminizing in the adult. Its always benign evolution in infancy and its occasional malignity in the adult (20%) are commented on and reviewed.