Sudden Testicular Failure: Causes, Presentation, and Management

Causes and Risk Factors

Testicular torsion, defined as twisting of the spermatic cord that compromises blood flow to and from the testes, can present with abrupt scrotal pain developing within minutes, and is a surgical emergency requiring intervention within 6-8 hours to prevent permanent testicular damage or loss, according to the American College of Radiology 1
Orchitis, or severe inflammation of the testes, can lead to rapid testicular damage in some cases, as noted by the American College of Radiology 1

Acute onset of severe unilateral scrotal pain, often accompanied by nausea and vomiting, and scrotal swelling and redness developing rapidly (within minutes to 1-2 days), are common presentations of sudden testicular failure, as described by the American College of Radiology and Praxis Medical Insights 1, 3
Pain is typically not relieved when the testes are elevated (negative Prehn sign), unlike in epididymitis, according to the American College of Radiology 1

Ultrasound with Doppler is the first-line imaging modality if diagnosis is uncertain, showing decreased or absent blood flow to the affected testicle, an enlarged, heterogeneous testis, and possible "whirlpool sign" (twisted spermatic cord), as recommended by Praxis Medical Insights 3
Early manifestations on ultrasound may include diminished arterial velocity and decreased diastolic flow, according to Praxis Medical Insights 3

Delay in diagnosis beyond 6-8 hours significantly increases risk of testicular loss, highlighting the importance of prompt intervention, as noted by the American College of Radiology and Praxis Medical Insights 1, 3

The Testicular Workup for Ischemia and Suspected Torsion (TWIST) score can help identify high-risk patients who need immediate surgical intervention without imaging, as described by the American College of Radiology 1, 4
Testicular torsion has a bimodal distribution, occurring more frequently in neonates and postpubertal boys, but can occur at any age, according to the American College of Radiology 1
False-negative Doppler evaluations can occur in partial torsion or spontaneous detorsion, as noted by Praxis Medical Insights 3