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Rhabdoid papillary meningioma
1First Department of Pathology, Fukushima Medical University School of Medicine, Fukushima, Japan. hirohojo@fmu.ac.jp
The American Journal of Surgical Pathology
|June 23, 2001
Summary
This study details an unusual rhabdoid papillary meningioma in a teenage boy, highlighting its aggressive behavior and complex cellular features. Immunohistochemical and ultrastructural analyses are crucial for diagnosing this rare brain tumor.
Area of Science:
- Neuro-oncology
- Pathology
- Pediatric Oncology
Background:
- Rhabdoid papillary meningioma is a rare and aggressive variant of meningioma.
- Accurate diagnosis is challenging due to overlapping histological features with other tumors.
Observation:
- A 15-year-old boy presented with a left posterior fossa dura-based mass with significant extracranial extension.
- The tumor displayed a mix of meningothelial, papillary, and rhabdoid cytologic features.
- Histological analysis revealed focal expression of glial fibrillary acidic protein, neurofilament, and alpha-smooth muscle actin, complicating diagnosis.
Findings:
- Meningothelial differentiation was confirmed by whorl formation and coexpression of epithelial membrane antigen and vimentin.
- Rhabdoid morphology was characterized by sheets of cells with eccentric nuclei and eosinophilic cytoplasm containing intermediate filament whorls.
- Immunohistochemical and ultrastructural analyses were essential to differentiate from other entities and confirm the diagnosis.
Implications:
- This case underscores the importance of comprehensive diagnostic techniques for rare brain tumors.
- Understanding the complex immunophenotype aids in predicting tumor behavior and guiding treatment strategies.
- Further research into the molecular basis of aggressive meningioma variants is warranted.