testicular cancer

85) a, Yolk sac tumor

yolk sac tumor is the most common testicular tumor in infants and children. Teratoma is the
most common tumor in prepubertal males. Yolk sac tumor is the testicular tumor with best
prognosis.

Choriocarcinoma occurs in second and third decade and is highly malignant. Leydig cell  tumor is the most common non-germ cell tumor of testis with bimodal distribution, first at 5-9 yrs of age and second incidence at 25-35 yrs of age.

(Smith)