29th April 2024

A 30-year-old man presents to the emergency department with a 3-day history of increasing pain and swelling in his left testicle.

A 30-year-old man presents to the emergency department with a 3-day history of increasing pain and swelling in his left testicle. He reports a low-grade fever and mild dysuria. He denies any recent trauma or sexual contacts. On examination, the left testicle is swollen, red, and tender. Urinalysis shows mild pyuria. His medical history is unremarkable, and he takes no regular medications.

Which is the most likely diagnosis?