الفهرس 
Prevalence of maxillofacial non-odontogenic bone and cartilage tumors in educational hospitals and institutions in cairo governorate a retrospective study
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Abstract
The aim of this study was to identify the prevalence of the primary non-odontogenic maxillofacial bone and cartilage tumors and to compare the results of this study with other findings in the literature.
Methodology: Clinical data (age, sex and site) and histopathological diagnosis of primary non-odontogenic maxillofacial bone and cartilage tumors (according to the WHO 2017 classification of head and neck tumors, 4th edition) diagnosed between January 2010 and December 2019, were collected from the histopathologic reports of Cairo governorate educational hospitals and institutions.
Results: Out of 11,444 archival reports -found in the maxillofacial bones, and paranasal sinuses- collected from Cairo governorate educational hospitals and institutions, 186 were reported as non-odontogenic maxillofacial bone and cartilage tumors, giving a prevalence of 1.63%. Osteosarcoma was found to be the most prevalent non-odontogenic bone and cartilage tumor, followed by chondrosarcoma and osteoma, respectively. It was found that females were more prone to maxillofacial bone and cartilage tumors. The studied group of tumors usually affected a mean age of 36.2 years for the intra-oral lesions and 43.8 for the extra-oral lesions.
Conclusion: The non-odontogenic maxillofacial bone and cartilage tumors represent 1.63% in Cairo governorate. There were some demographic variations seen in some of the tumors studied, different from the literature, however, osteosarcoma was found to be the most common lesion among these tumors, representing almost 50% of the studied lesions.