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Dedifferentiated Chondrosarcoma: A Report of a Rare and Intriguing Case
Sumithra A1, Vallal Kani1, Sudha Vasudevan1
1Department of Pathology, Saveetha Medical College and Hospital, Saveetha Institute of Medical and Technical Sciences, Saveetha University, Chennai, IND.
Cureus
|October 3, 2024
Summary
Dedifferentiated chondrosarcoma (DDCS) is an aggressive cancer. Early diagnosis and a multidisciplinary treatment approach, including surgery and adjuvant therapies, are crucial for managing this rare tumor.
Area of Science:
- Oncology
- Orthopedic Oncology
Background:
- Dedifferentiated chondrosarcoma (DDCS) represents a rare and aggressive subtype of chondrosarcoma (CS).
- Conventional chondrosarcoma is the most common subtype, but rarer forms like DDCS, clear-cell CS, and mesenchymal CS exist.
Observation:
- A unique case of DDCS occurred in a 28-year-old male presenting with a finger swelling.
- Radiographic findings revealed sclerotic margins and a central diaphyseal lytic lesion.
- Immunohistochemical analysis confirmed DDCS using S-100 and Ki67 markers.
Findings:
- The diagnosis of dedifferentiated chondrosarcoma was confirmed through immunohistochemical markers.
- The tumor presented as a lytic lesion with sclerotic margins on the proximal phalanx of the fourth finger.
Implications:
- This case highlights the critical need for early identification of DDCS.
- Tailored management strategies integrating surgery, chemotherapy, and radiation are essential for improving outcomes in DDCS patients.

