eng Science and Education Publishing American Journal of Medical Case Reports 2374-216X 2023-03-24 11 3 63 66 10.12691/ajmcr-11-3-6 AJMCR20231136 article Nabil Benahmed Nabil.benahmed@umontreal.ca 1 Ryma Kabir 2 Katarina Kontaxis 3 Alice Becker 4 Nimaat Pertick 5 Resident Stomatology, Oral and Maxillofacial Surgery, University of Montreal Hospital Center (CHUM) 每 Canada Periodontology Departement, Professor, University of Montreal 每 Canada Oral and Maxillofacial Surgery Departement, Professor, University of Montreal 每 Canada Oral Surgery Department, Head of Clinic, University Hospital Assistant, Nancy Hospital Center (CHRU Nancy) 每 France Oral and Maxillofacial Surgery Department, Chief of Surgery, University of Montreal Hospital Center (CHUM) 每 Canada Introduction: Metastases of the oral cavity are rare and concern only a tiny part of the neoplasias of the oral cavity. The detection of an atypical lesion should always alert the clinician to the possibility of primary or secondary cancerous involvement. Observation: The case presented here describes a patient presenting to the consultation for pain in the temporomandibular joint. A panoramic X-ray revealed an atypical osteolytic lesion located at the level of the left articular condyle. Additional investigations confirmed the existence of a lytic lesion indicating a metastasis or a primary sarcomatosis type. Complementary examinations made it possible to establish the diagnosis of a poly-metastatic pulmonary adenocarcinoma and to begin the management of the patient who was unaware of her condition. Conclusion: The discovery of an atypical bone lesion should alert the clinician and requires the performance of additional examinations to establish a diagnosis that can condition the survival of a patient. http://pubs.sciepub.com/ajmcr/11/3/6/ajmcr-11-3-6.pdf metastasis mandibular condyle pulmonary adenocarcinoma