There are various types, each with different prevalence and different prognosis: Nearly all types of testicular tumors stem from germ cells , which are the special sperm-foming cells within the testicles.

Seminomas arise from immature germ cells and are slow growing and usually have a good prognosis.

Nonseminomas arise from more mature, specialized germs cells and tend to be more aggressive.

Embryonal carcinomas, yolk sac tumors and choriocarcinomas are all nonseminomas. Seminomas (about 40% of all testicular cancers) Spermatocystic embryonal carcinomas (about 20% of all testicular cancers)
Yolk sac tumor (about 60% of all testicular cancers in young boys) Teratomas (about 7% in adult men and 40% in young boys) Choriocarcinoma (rare) There are three stages of Testicular Cancer:

• stage I : the cancer is confined to the testicle
• stage II- the cancer has spread to the retroperitoneal nodes ((located in the rear of the body below the diaphragm)
• stage III:  The cancer has spread to remote sites in the body, e.g the lungs

The cure rates for stages I and II testicular cancer are around 95%., and 70% for stage III.