secondary avascular necrosis osteonecrosis of the jaw https://www.malacards.org/card/osteonecrosis_of_the_jaw MEDGEN:751019 jaw osteonecrosis SCTID:441809006 GARD:0021663 UMLS:C2711248 ONJ Orphanet:399293 ICD9:733.45 NCIT:C63924 An area of necrotic bone in the mandible or maxilla. MONDO:0018378 osteonecrosis of jaw