Sopta, Jelena (24328547800)Jelena (24328547800)SoptaDordević, Aleksandar (6603291241)Aleksandar (6603291241)DordevićTulić, Goran (23036995600)Goran (23036995600)TulićMijucić, Vesna (23035354900)Vesna (23035354900)Mijucić2025-07-022025-07-022008https://doi.org/10.1007/s00432-007-0262-5https://www.scopus.com/inward/record.uri?eid=2-s2.0-36849090844&doi=10.1007%2fs00432-007-0262-5&partnerID=40&md5=6d1b5867d64590a22c65dcc417ceb774https://remedy.med.bg.ac.rs/handle/123456789/14271Backgroud: Dedifferentiated chondrosarcoma represents a special form of the chondrosarcoma characterized by the presence of well-differentiated cartilaginous component in juxtaposition with the malignant mesenchymal tumor of high-malignancy grade. Methods: The study was performed on 25 tissue samples obtained by biopsy of the primary malignant bone tumors. Results: Out of the total of 25 patients, 13 were males and 12 were females. Their average age was 59.9 years (39-75). Radiological examination verified the presence of the pathological fractures in 14 patients. The skeletal distribution clearly indicates that the femur is the most frequent site of affection (in 15 patients-60%). Morphological analysis verified the presence of "precursor cartilaginous lesion" or low-grade cartilaginous component in all cases. Classification of the high-grade components was based on the immunohistochemical analyses, which evidenced MFH in 18 cases, osteosarcoma in 4, while fibrosarcoma was evidenced in 2 and rhabdomyosarcoma in 1 case. In 20 patients, out of whom 14 had existing fractures, amputation was indicated. In five patients (fracture-free), resection limb-salvage surgical intervention was performed. Conclusion: The lethal outcome ensues within less than 2 years in all patients. © 2007 Springer-Verlag.ChondrosarcomaDedifferentiated