When there are dilated veins there is stagnation of blood in the scrotal ... include - Varicocele with low sperm count that are not visible clinically and can be picked up only by ultrasound ...

Varicocele is ... movement of a testicle. Ultrasound is the most commonly used tool to examine the testes. This non-invasive test uses sound waves to look inside the scrotum for any abnormalities.