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Sarcomatous transformation in cranial chordoma
F H Tomlinson1, B W Scheithauer, P A Forsythe
1Department of Neurosurgery, Mayo Clinic, Rochester, MN.
Neurosurgery
|July 1, 1992
Summary
Anaplastic transformation in cranial chordoma is rare, occurring in 4% of cases without prior radiation. This sarcomatous change involves a loss of epithelial markers, suggesting a de novo process.
Area of Science:
- Oncology
- Pathology
- Neurosurgery
Background:
- Chordomas are rare bone tumors arising from notochordal remnants.
- Cranial chordomas represent a subset with specific clinical challenges.
- Understanding tumor behavior and transformation is crucial for patient outcomes.
Observation:
- A retrospective study analyzed 52 cranial chordoma cases treated between 1966 and 1984.
- Two tumors (4% incidence) exhibited anaplastic features.
- These anaplastic changes occurred de novo, unrelated to prior irradiation.
Findings:
- Immunohistochemistry revealed a mixed mesenchymal-epithelial phenotype typical of chordoma in non-anaplastic areas.
- Anaplastic components showed a loss of reactivity for keratin and epithelial membrane antigen.
- This immunophenotypic shift indicates a loss of epithelial differentiation.
Implications:
- Sarcomatous change in chordoma is a rare but significant event.
- The de novo occurrence suggests intrinsic tumor biology rather than treatment-induced effects.
- Loss of epithelial markers in anaplastic areas may correlate with aggressive behavior.