Final answer:
The symptoms described, including unilateral and gradual onset of pain, swelling, and a positive Prehn sign, are indicative of Epididymitis, which is inflammation of the epididymis and treated with antibiotics and anti-inflammatory medications.
Step-by-step explanation:
The patient presenting with unilateral, gradual onset of pain, swelling, and a positive Prehn sign (decreased pain with elevation of scrotum above pubic symphysis) is indicative of Epididymitis. Epididymitis is an inflammation of the epididymis, a structure within the scrotum where sperm matures and is stored. Key symptoms include discomfort or pain in the scrotum, testicles, and groin, as well as the swelling and warmth of the affected area. Infections causing epididymitis are often bacterial in nature, and treatment generally includes antibiotics, anti-inflammatory drugs, and painkillers to manage symptoms and prevent complications such as abscess formation or infertility due to permanent damage to the epididymis. In comparison, testicular torsion is characterized by a sudden onset of severe pain and is a surgical emergency. Hydrocele and varicocele usually present with painless swelling of the scrotum and do not typically have pain that decreases with scrotal elevation.