Parachordoma
Supplemental Studies
Immunohistology
| S100 | Positive |
| CD8/18, CAM5.2 | Positive |
| EMA | Positive |
| CK34BE12 | Negative |
| CKAE1 | Negative |
| CK7, CK20 | Negative |
| CEA | Negative |
| Type IV Collagen | Surrounds nests |
| CD57 | Positive |
| Smooth muscle actin | Negative |
| Muscle specific actin | Negative |
| Desmin | Negative |
| CD34 | Negative |
| CD31 | Negative |
Genetic analysis
- Various clonal abnormalities reported, none consistent
