Serial pictures of endoscopic curettage procedure of an ABC (case 7) showing: first pic (top left) the lesion from inside after accessing it through its bony cortex with a trocar. Another portal was created to introduce a 3.5 blade of a motorized shaver followed by a blunt curette (top right). The curettage procedure ends when a healthy bony walls of the lesion (bottom) is clearly visualized from all angles.