<prompt> 40-year-old men are suffering from fever pain in the scrotum which is not relieved by elevation of the testis. 3 days before had sexual contact with a young female -Testicular tumourAcute epididymitisTorsion of testisAcute orchitis  <response>: Torsion of testis can be differentiated from acute epididymitis by Prehns sign. ieOn the elevation of testis the pain increases in TorsionOn the elevation of the testis, the pain decreases in epididymoorchitis.Dont be confused with fever, it can also occur in torsion, especially in older patients. 