Varicocele, which is the most common cause of infertility in man, is detected by means physical examination and color Doppler sonography. We analyzed the results of percutaneous sclerotherapy of the spermatic veins in 76 out of 103 patients with varicocele: antegrade sclerotherapy was performed in 11 patients while 92 men underwent retrograde scleroembolization. Color Doppler sonography was performed one month later and showed persistence of varicocele in 3 patients who underwent retrograde sclerotherapy. Retrograde percutaneous sclerotherapy of the spermatic vein represents, in our opinion, the gold standard in the treatment of primitive and recurrent left varicocele, because of its efficacy and minimal invasive nature. Antegrade sclerotherapy is an effective alternative treatment when retrograde access is not possible.