Cortical/Spinal venous reflux (CVR) was less common in patients with only VE shunts, being present in only 45/150 (30%) of the patients (all with venous restriction). There was an increased rate in patients with DE and LE shunts, being 43/67 (64%) of the only DE shunts and all (100%) of the LE shunts, which included the three patients with the mixed type with LE lesions (p>0.001). In the mixed type of the VE+DE lesions, CVR was present in 13/16 (81%) cases