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Stages of ONJ (adapted from Bagan et al. [78]) (with permission)): (a) an initial stage of osteonecrosis without visible necrotic bone. (b) Osteonecrosis of the upper jaw; stage 1. The patient had no symptoms. (c) Osteonecrosis of the jaw; stage 2. A more extensive area of necrosis and with symptoms. (d) Osteonecrosis of the jaw; stage 3. The patient had an extraoral (cutaneous) fistula.
