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An ultrastructural study of extraskeletal Ewing's sarcoma
Acta Pathologica Japonica
|March 1, 1984
Summary
Extraskeletal Ewing's sarcoma shares cellular features with its bone counterpart, primarily undifferentiated blastemic cells with glycogen. This finding suggests a unified classification for Ewing
Area of Science:
- Oncology
- Pathology
- Cell Biology
Background:
- Ewing's sarcoma is a malignant bone tumor.
- Extraskeletal Ewing's sarcoma (EES) is a rare variant occurring in soft tissues.
- Understanding the ultrastructural and cytochemical characteristics of EES is crucial for accurate diagnosis and classification.
Observation:
- The studied extraskeletal Ewing's sarcoma case exhibited densely packed, undifferentiated blastemic cells and "darker cells."
- Principal tumor cells displayed scant cytoplasm with glycogen granules, large nuclei, and rudimentary junctional complexes.
- Some "darker cells" suggested histiocytic differentiation, while others showed signs of degeneration.
Findings:
- Ultrastructural and cytochemical analysis revealed EES is composed of undifferentiated cells with glycogen.
- No tumor cells tested positive for peroxidase, lysozymes, or Factor VIII-related antigen.
- The presence of glycogen appears to be a key defining feature for both osseous and extraskeletal Ewing's sarcomas.
Implications:
- This study supports classifying both osseous and extraskeletal Ewing's sarcomas as undifferentiated sarcomas.
- The findings aid in differentiating EES from other soft tissue tumors.
- Further research into the role of glycogen in Ewing's sarcoma pathogenesis is warranted.