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Classification of Uterine PEComas Using Gynecologic-Specific Criteria
| Classification | Definition | PEComas With Aggressive Behavior Meeting Criteria | PEComas Without Aggressive Behavior Meeting Criteria |
|---|---|---|---|
| Benign/Uncertain Malignant Potential | < 4 features (≥ 5 cm, high-grade atypia, mitoses > 1/50 HPFs, necrosis, LVI) | 4/11 (36%) | 19/19 (100%) |
| Malignant | ≥ 4 features | 7/11 (64%) | 0/19 (0%) |
HPF=high-power field; LVI=lymphovascular invasion
