| Case 1 | Case 2 | Case 3 |
Multinuclear giant cells | Observed | Observed | Observed |
Xhantomatous cells | Observed | Observed | Observed |
Granular body | Observed | Not observed | Not observed |
Rosenthal fibers | Observed | Observed | Observed |
Nuclear inclusions | Not observed | Not observed | Observed |
Increased reticular fibers | Observed | Observed (dense) | Observed |
Perivasculary lymphocytes | Observed | Observed | Not observed |
Calcifications | Not observed | Not observed | Not observed |
Mitosis/10 HPF | 5 | 5 | 8 |
Endothelial proliferation | Observed | Not observed | Observed |
Necrosis | Observed | Not observed | Observed |
Ki-67 proliferation index | 90% | 20% | 30% |
GFAP | Positive | Positive | Positive |
MAP-2 | Positive | Negative | Negative |
Synaptophysin/Neu-N/chromogranin | Negative | Negative | Negative |
CD-34 | Negative | Negative | Negative |
p-53 | 50% | Negative | 3% |
BRAF mutation (V600E) | Observed | Not observed | Observed |
P16 mutation | Not observed | Technical problem | Observed |