Yolk sac tumor of the testis in an infant

We reported a case of a 7-month-old infant with stage I yolk sac tumor of the testis, who is the youngest patient in our hospital so far. The infant was noted with painless swelling of his right testis by his parents for a month. Serum α-fetoprotein level was up to 4734.19 ng/ml preoperatively and decreased to normal range four weeks after operation. The chest X-ray and abdominal computed tomography (CT) scan were negative. The case is presented and the literature is reviewed for researching the adequate management.