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[Poorly-differentiated chordoma with INI1 loss: a clinicopathologic study]
1Department of Pathology, Children's Hospital of Fudan University, Shanghai 201102, China.
Zhonghua Bing Li Xue Za Zhi = Chinese Journal of Pathology
|October 20, 2017
Summary
Pediatric poorly differentiated chordoma with INI1 loss presents unique clinicopathologic features. This rare tumor, distinct from classical chordoma, may indicate a poorer prognosis and requires careful differential diagnosis.
Area of Science:
- Oncology
- Pathology
- Genetics
Background:
- Chordoma is a rare bone tumor arising from notochordal remnants.
- Poorly differentiated chordoma with INI1 loss is an aggressive subtype predominantly affecting children.
- Understanding its characteristics is crucial for accurate diagnosis and treatment.
Observation:
- Two pediatric cases of poorly differentiated chordoma with INI1 loss were analyzed.
- Clinical presentation included neck pain and progressive muscle weakness.
- Radiological findings revealed clivus bone destruction and brainstem compression.
Findings:
- Histopathology showed atypical, poorly organized tumor cells with inflammatory infiltration.
- Immunohistochemistry confirmed expression of cytokeratin, EMA, and brachyury, with INI1 loss.
- Fluorescence in situ hybridization (FISH) detected INI1 gene deletion.
Implications:
- INI1 loss in pediatric chordoma correlates with poor differentiation and potentially adverse prognosis.
- Nuclear brachyury expression aids in differentiating from other neoplasms like atypical teratoid/rhabdoid tumors.
- Accurate diagnosis of this rare chordoma subtype is essential for appropriate management.
