A 14-year-old boy presents to the emergency department with sudden-onset severe left scrotal pain that woke him from sleep. On examination, the left testis is high-riding with a horizontal lie, and the cremasteric reflex is absent. Scrotal ultrasound with color Doppler is performed. The structure marked **B** in the diagram shows absent intratesticular flow in the left testis, while the right testis demonstrates preserved flow. What is the most critical next step in management?

Explanation

## Why "Immediate surgical exploration and detorsion via scrotal incision without waiting for further imaging confirmation" is right The absence of color Doppler flow (marked **B**) in the setting of acute severe scrotal pain, high-riding testis, absent cremasteric reflex, and preserved contralateral flow is pathognomonic for testicular torsion. The spermatic cord twisting causes ischemia with a salvage rate of 90% if detorsion occurs within 6 hours, dropping to ~50% at 12 hours and ~10% at 24 hours. This is a **surgical emergency** where every minute matters. The imaging finding of absent intratesticular flow confirms the clinical diagnosis and mandates immediate operative intervention—detorsion, assessment of viability, orchidopexy of the affected testis, and prophylactic orchidopexy of the contralateral testis (due to bilateral bell-clapper anomaly). Delay for any reason, including additional imaging, risks testicular loss and infertility. ## Why each distractor is wrong - **Administer broad-spectrum antibiotics and observe for 24 hours to rule out epididymitis**: Epididymitis typically presents with fever, gradual onset, and preserved or increased Doppler flow. The absent flow on color Doppler rules out epididymitis and confirms ischemia. Observation wastes critical time; the salvage rate plummets after 6 hours. This approach is dangerous. - **Perform manual detorsion in the emergency department followed by outpatient urology follow-up in 48 hours**: While manual detorsion (rotating medial-to-lateral, "opening the book") can be attempted as a temporizing measure, it is NOT a definitive treatment. Even if manual detorsion relieves pain, emergency surgery is still mandatory to formally detorse, assess tissue viability, perform orchidopexy of the affected testis, and perform prophylactic orchidopexy of the contralateral testis. Outpatient follow-up is inappropriate for a surgical emergency. - **Order MRI of the scrotum to confirm the diagnosis before proceeding to the operating room**: The diagnosis is already confirmed by clinical presentation (sudden severe pain, high-riding testis, absent cremasteric reflex) and color Doppler ultrasound (absent intratesticular flow). MRI adds no diagnostic value and causes unacceptable delay. The time-critical nature of torsion (salvage rate 90% within 6 hours) mandates immediate surgery without further imaging. **High-Yield:** Absent color Doppler flow in acute scrotal pain = testicular torsion until proven otherwise; go directly to OR; every minute counts—salvage rate halves from 90% to 50% between 6 and 12 hours. [cite: Campbell-Walsh Urology 12e; Bailey & Love 28e]