Abstract
Purpose
5-Aminolevulinic acid (5-ALA) fluorescence-guided resection of high-grade gliomas (HGG) increases the extent of resection (EOR) and progression-free survival. The headlamp/loupe combination has been introduced as a method of performing fluorescent-guided surgery. This study aims to understand the correlation between fluorescent intensity and histology and between residual fluorescence and radiographic EOR utilizing the headlamp/loupe device.
Methods
Intraoperative samples resected using the headlamp/loupe device from 14 patients were labeled as PINK, VAGUE, or NEGATIVE depending on the degree of fluorescence. Histological assessment of microvascular proliferation, necrosis, and cell density was performed, and samples were classified as histologically consistent with glioblastoma (GBM), high-grade infiltrating glioma (HGIG), IG, or non-diagnostic (NDX). The presence of intraoperative residual fluorescence was compared to EOR on post-operative MRI.
Results
There was a significant difference in cell density comparing PINK, VAGUE, and NEGATIVE specimens (ANOVA, p < 0.00001). The PPV of PINK for GBM or HGIG was 88.4% (38/43). The NPV of NEGATIVE for IG or NDX was 74.4% (29/39). The relationship between the degree of fluorescence determination and histological results was significant (X2 (6 degrees of freedom, N = 101) = 42.57, p < 0.00001). The PPV of intraoperative GTR for post-operative GTR on MRI was 100%, while the NPV of intraoperative STR for post-operative STR on MRI was 60%.
Conclusion
The headlamp/loupe device provides information about histology, cell density, and necrosis with similar PPV for tumor to the operative microscope. Safe complete resection of florescence has a PPV of 100% for radiographic GTR and should be the goal of surgery.
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Abbreviations
- 5ALA:
-
5-Aminolevuilnic acid
- EOR:
-
Extent of resection
- GBM:
-
Glioblastoma
- GTR:
-
Gross total resection
- HGG:
-
High-grade gliomas
- HGIG:
-
High-grade infiltrating glioma
- MRI:
-
Magnetic resonance imaging
- NDX:
-
Non-diagnostic
- NPV:
-
Negative predictive value
- PFS:
-
Progression-free survival
- PPV:
-
Positive predictive value
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Giantini-Larsen, A.M., Kharas, N., Pisapia, D. et al. Histology of high-grade glioma samples resected using 5-ALA fluorescent headlight and loupe combination. Acta Neurochir 165, 567–575 (2023). https://doi.org/10.1007/s00701-023-05496-8
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DOI: https://doi.org/10.1007/s00701-023-05496-8