Şenyiğit, Eceİşkan, Nur GülceÇiftdemir, Mert2021-11-202021-11-2020182148-47242548-0030https://dergipark.org.tr/tr/pub/tmsj/issue/36656/420844https://dergipark.org.tr/tr/download/article-file/467641https://hdl.handle.net/20.500.14551/6294Aims: Periosteal chondroma is a rare and benign cartilage tumor seen mostly in long bones and in patients under30 years of age. In this case report, it is aimed to present a 16-year-old female patient with a periosteal chondroma inthe distal femur.Case Report: A 16-year-old female patient was admitted to the hospital with the history of pain in her distal partof right thigh. A superficial cortical erosion with well-defined borders without any relation to the intramedullaryarea was seen in magnetic resonance imaging. The lesion was regarded as periosteal chondroma and marginal excisionwas performed.Conclusion: This case report shows the importance of the differential diagnosis in cortical lesions. Periostealchondroma may be considered when a patient has a history of long term pain in adolescent age groupeninfo:eu-repo/semantics/openAccessChondromathighadolescentperiosteumArticle511417420844