Stage IA includes: pT1, N0, M0, S0. pT1: Tumor limited to the testis and epididymis without vascular/lymphatic invasion; tumor may invade into the tunica albuginea but not the tunica vaginalis. N0: No regional lymph node metastasis. M0: No distant metastasis. S0: Marker study levels within normal limits. (AJCC 6th and 7th eds.) [from NCI]