Stage I is divided into stage IA, stage IB, and stage IS, and is determined after a radical inguinal orchiectomy (surgery to remove the testicle) is done. In stage IA, cancer is in the testicle and epididymis and may have spread to the inner layer of the membrane surrounding the testicle; all tumor marker levels are normal. In stage IB, cancer is in the testicle and the epididymis and has spread to the blood or lymph vessels in the testicle; or has spread to the outer layer of the membrane surrounding the testicle; or is in the spermatic cord or the scrotum and may be in the blood or lymph vessels of the testicle; all tumor marker levels are normal. In stage IS, cancer is found anywhere within the testicle, spermatic cord, or the scrotum, and either all tumor marker levels are slightly above normal or one or more tumor marker levels are moderately above normal or high.