Cross section showing the pampiniform venus plexus There are three main theories as to the anatomical cause; the first has to do with the geometry of the veins, wherein the vein on the left side connects to the larger outflowing vein at a right angle, which tends to fail; the second is that valves that are supposed to prevent backflow fail (venous insufficiency); the third is due to excessive pressure in upstream arteries, created by nutcracker syndrome.
Varicocele
Chronic testicular pain
Urethrocele
Testicular pain
Hematocele
Hydrocele
Inguinal hernia
Spermatocele