RESUMEN
The authors report an unusual case of Leydig cell tumor in a 3 year-old child with a clinical picture of aggressive behavior and increase in the penile size since the age of 15 months. Genital examination showed a small increase in the consistency of the right testis and ultrasound showed a heterogeneous texture and increase in dimensions in relation to the left testis. Hormonal dosages showed increased serum testosterone with normal LH and FSH. All other hormonal tests were normal and adrenal and cranial tomographies did not reveal abnormalities. Anatomo-pathological examination of the right testis, removed by an inguinal incision showed the presence of a Leydig cell tumor. After surgery, normalization of testosterone levels was observed and identified in the early postoperative period. The authors present a discussion regarding this uncommon neoplasm