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WHO grading of SFTs/HPCs.
| Histologic Features | WHO Grade | Old Definition |
|---|---|---|
| High collagen content, low cellularity | I | SFT |
| Low collagen content, higher cellularity, staghorn vasculature | II | HPC |
| Anaplastic appearance, ≥5 mitosis per 10 HPFs | III | Anaplastic HPC |
HPC, Hemangiopericytoma; HPFs, high power fields; SFT, Solitary fibrous tumor; WHO, World Health Organization; Modified from Louis et al. [7].
