Fibroma of Tendon Sheath
Supplemental Studies
Immunohistology
| Vimentin | Strong diffuse positive |
| Smooth muscle actin | Strong diffuse positive |
| CD34 | Positive (few cases) |
| CD68, CD163 | Focal |
| Desmin | Negative |
| S100 | Negative |
| Beta-catenin | Negative |
| Vimentin | Strong diffuse positive |
| Smooth muscle actin | Strong diffuse positive |
| CD34 | Positive (few cases) |
| CD68, CD163 | Focal |
| Desmin | Negative |
| S100 | Negative |
| Beta-catenin | Negative |