Gliosarcoma: Neuroimaging and Immunohistochemical Findings.

Area of Science:

• Neuro-oncology
• Neuroradiology
• Molecular Pathology

Background:

• Gliosarcoma (GSC) is an intra-axial tumor with glial and mesenchymal components.
• GSC is classified as a variant of isocitrate dehydrogenase (IDH)-wild type glioblastoma (GBM).
• Understanding GSC's imaging and molecular characteristics is crucial for diagnosis and treatment.

Purpose of the Study:

• To evaluate the imaging features of GSC.
• To assess the molecular profile of GSC.
• To determine correlations between imaging and molecular markers in a large patient cohort.

Main Methods:

• Retrospective collection of 25 pathology-proven GSC cases over 16 years.
• Documentation of IDH status, p53, PTEN, MIB-1, EGFR amplification, and MGMT methylation.
• Tabulation of imaging findings and logistic regression analysis for correlations.

Main Results:

• All 25 GSC cases were IDH-wild type, confirming GSC as an IDH-wild type GBM variant.
• No significant correlation was found between molecular markers (IDH, p53, PTEN, EGFR, MGMT) and imaging characteristics.
• Imaging revealed nodular thickening near dural contact in necrotic lesions.

Conclusions:

• GSC is consistently IDH-wild type, aligning with its classification as a GBM variant.
• Molecular markers do not significantly correlate with imaging findings in GSC.
• Further research may elucidate other factors influencing GSC presentation.