Bisphosphonate-associated osteonecrosisofthejawsinlung cancer patients

Osteonecrosis of the jaw (onj) can occur as a complication of bisphosphonate therapy. this condition has been described in cancer patients and its development has been associated with prolonged exposure to high doses of bisphosphonates. bad dental hygiene,a history of prosthesis or dental extraction,chemotherapy,corticosteroids,and radiation therapy of the head and neck are reported risk factors. in the initial stages it may be asymptomatic,but the patient subsequently develops severe pain and progressive exposed bone. the authors describe three cases of onj in lung cancer patients after prolonged exposure to bisphospho-nates and there were known risk factors. onj can seriously affect the quality of life of cancer patients. an early diagnosis may reduce or avoid the consequences of progressive bone lesion. © 2013 sociedade portuguesa de pneumologia.