A testicular (or scrotal) sonogram is an examination of the testicles and the surrounding tissues in your scrotum. Ultrasound is the primary imaging modality used to observe and diagnose abnormalities in the testicles and scrotum. Images are obtained of each teste, epididymis, spermatic cord, venous plexus and scrotal wall, as well as an assessment of blood flow. The procedure is safe and painless, lasting approximately 30 minutes.