Intraoperative photographs showing a reddish-brown lesion overlying the thecal sac (Left) which was removed en bloc following laminectomy (Right). Intraoperative photographs showing a reddish-brown lesion overlying the thecal sac (Left) which was removed en bloc following laminectomy (Right). Mario Benvenutti-Regato et al. Int J Spine Surg 2015;9:67 Copyright © 2015 ISASS - This manuscript is generously published free of charge by ISASS, the International Society for the Advancement of Spine Surgery