When the pampiniform plexus becomes dilate, it is referre to as a varicocele. These special veins are responsible for draining blood from the testes and returning the blood to the heart. A varicocele arises with occlusion of the venous return resulting in stasis and subsequent varicose dilation of the veins. This stasis is cause by valve incompetence in the veins, as is seen in varico... https://nimaaya.com/blog/varicocele-causes-symptoms-male-fertility/