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High-grade extraskeletal myxoid chondrosarcoma: a high-grade epithelioid malignancy
D R Lucas1, C D Fletcher, N V Adsay
1Department of Pathology, Wayne State University School of Medicine, Harper Hopspital and Karmanos Cancer Center, Detroit, MI 48201, USA.
Histopathology
|September 1, 1999
Summary
High-grade extraskeletal myxoid chondrosarcoma is a rare, aggressive soft tissue sarcoma. This study details four cases, highlighting epithelioid cells and poor prognosis, emphasizing its inclusion in differential diagnoses.
Area of Science:
- Pathology
- Oncology
- Soft Tissue Sarcomas
Background:
- Extraskeletal myxoid chondrosarcoma (EMC) is typically low-to-intermediate grade with a prolonged course.
- High-grade variants of EMC are rare and poorly characterized.
- Understanding high-grade EMC is crucial for accurate diagnosis and patient management.
Observation:
- This study presents four cases of high-grade extraskeletal myxoid chondrosarcoma.
- Tumors were located in the thigh, paraspinal soft tissue, and perineum.
- Histological analysis revealed numerous large epithelioid cells within a myxoid matrix, with some cases showing transition to spindle cell sarcoma or rhabdoid features.
Findings:
- Three of the four patients developed metastases and died of the disease.
- Immunohistochemistry showed focal S100 protein and EMA expression in some cases.
- Ultrastructural examination revealed features consistent with chondrosarcoma, including unique microtubule aggregates.
Implications:
- High-grade EMC is an aggressive soft tissue sarcoma with a poor prognosis.
- It necessitates inclusion in the differential diagnosis of epithelioid malignancies.
- Further research into high-grade EMC is warranted to improve treatment strategies.