These are the classical appearances of a varicocele.  A varicocoele is the dilatation of the pampiniform plexus of veins, a network of many small veins found in the male spermatic cord.

This is the appearance of the so-called 'bag of worms' felt clinically on examination.

The veins were dilated even in the supine resting position in keeping with a Grade 4 varicocele.