Stop-type and shunt-type varicoceles: venographic findings.

Forty-four patients with a left-sided idiopathic varicocele were examined with bidirectional Doppler ultrasound (US), physical examination, and percutaneous retrograde venography. On the basis of the Doppler findings, the varicoceles were classified as either stop type or shunt type. On venography, the stop-type varicoceles showed only retrograde blood flow (reflux) in the testicular (internal spermatic) vein, whereas each shunt-type varicocele showed both retrograde and orthograde (i.e., physiologic) venous blood flow: First, reflux appeared in the testicular vein, then orthograde flow occurred in the deferential vein, cremasteric vein, or both. The shunt-type varicocele therefore represented a kind of venous bypass. Thus, the existence of two hemodynamically different types of varicocele as suggested initially by Doppler US is confirmed by percutaneous retrograde venography. The shunting of venous blood appears to be a precondition for medium and large varicoceles and might have some prognostic significance for subfertility associated with varicoceles.