A rare astrocytic tumor with rhabdoid features
Shoichi Nagai1, Masanori Kurimoto, Shin Ishizawa
1Department of Neurosurgery, Faculty of Medicine, University of Toyama, 2630 Sugitani, Toyama 930-0194, Japan. shoichi@chive.ocn.ne.jp
Brain Tumor Pathology
|May 2, 2009
Summary
This study details a rare brain tumor with rhabdoid features in an 18-year-old man. The tumor was identified as an astrocytic tumor, not atypical teratoid/rhabdoid tumor, with rhabdoid cells arising from diffuse astrocytoma.
Area of Science:
- Neuro-oncology
- Pathology
Background:
- Rhabdoid features in brain tumors are rare and often associated with atypical teratoid/rhabdoid tumors (AT/RT).
- Distinguishing between AT/RT and other glial tumors with rhabdoid morphology is critical for accurate diagnosis and treatment.
Observation:
- An 18-year-old Japanese male presented with an extremely rare tumor in the left temporoparietal lobe.
- The tumor exhibited diffuse proliferation of medium to large round cells with eccentric nuclei, eosinophilic cytoplasm, and inclusion bodies, characteristic of rhabdoid morphology.
- Histological examination revealed an area resembling diffuse astrocytoma peripherally, with no primitive neuroectodermal or mesenchymal components.
Findings:
- The tumor lacked features of primitive neuroectodermal tumor, mesenchymal, or epithelial differentiation.
- Crucially, the tumor showed INI expression, a marker absent in AT/RT.
- The findings led to the conclusion that this was an astrocytic tumor with secondary rhabdoid features, originating from a diffuse astrocytoma component.
Implications:
- This case expands the differential diagnosis for brain tumors presenting with rhabdoid features.
- Accurate classification is essential for appropriate therapeutic strategies and prognostic assessment.
- Understanding the potential for secondary rhabdoid differentiation in astrocytic tumors is important for neuropathologists.
