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| Case 1 | Case 2 | Case 3 |
| Multinuclear giant cells | Observed | Observed | Observed |
| Xhantomatous cells | Observed | Observed | Observed |
| Granular body | Observed | Observed | Observed |
| Rosenthal fibers | Observed | Observed | Observed |
| Nuclear inclusions | Not observed | Not observed | Observed |
| Increased reticular fibers | Observed | Observed (mild) | Observed |
| Perivasculary lymphocytes | Observed | Observed | Observed |
| Calcifications | Observed | Not observed | Not observed |
| Mitosis/10 HPF | 5 - 6 | 5 | 6 |
| Endothelial proliferation | Observed | Not observed | Observed |
| Necrosis | Not observed (2) | Not observed | Observed |
| Ki-67 proliferation index | 80% | 20% | 20% |
| GFAP | Positive | Positive | Positive (focal) |
| MAP-2 | Positive | Negative | Negative |
| Synaptophysin/Neu-N/chromogranin | Negative | Negative | Negative |
| CD-34 | Negative | Negative | Negative |
| p-53 | 40% | Negative | 10% |
| BRAF mutation (V600E) | Observed | Not observed | Observed |
| P16 mutation | Not observed | Technical problem | Observed |