<prompt> Answer this question truthfullyWhat are the natural history, potential complications, and prognosis associated with Seminoma?  <response>: <reason> The symptoms of seminoma usually develop in the second to forth decade of life 15-35 years, and start with symptoms such as a painless testicular lump, abnormal semen analysis, possibly an acute onset testicular pain. Seminoma grows slower than non-seminomatous germ cell tumors. 