40 year old man is suffering from fever & pain in the scrotum which is not relieved by elevation of testis. 3 days before he had sexual contact with a young female :

Ans. is 'c' ie Torsion of testis Torsion of testis can be differentiated from acute epididymitis by Prehn's sign. ie. On elevation of testis the pain increases in - Torsion On elevation of testis the pain decreases in -- epididymo-orchitis. Don't be confused with fever, it can also occur in torsion, especially in older patients.