“…In parallel with the post-traumatic hypothesis, since its discovery by Nora et al the lesion has been speculated to be a tumor-like lesion or even a neoplasm. This theory has always been supported by the extremely high risk of local recurrences testified by several authors and in part by the histologic appearance of the lesions, described below in a dedicated paragraph [ 1 , 3 , 5 , 6 , 8 - 10 , 17 , 18 , 23 , 28 - 31 , 33 - 37 , 39 , 46 , 50 , 53 , 70 - 76 ]. Although in the first moment some authors theorized that BPOP could have been an intermediate stage that connected florid reactive periostitis with Turret exostosis [ 83 , 84 ], further studies definitely established Nora lesion as an independent pathological entity [ 8 , 9 , 22 33 ].…”