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Classification of gynecological PEComas.
| Category Criteria | |
|---|---|
| Benign | None of: Size ≥ 5 cm Infiltrative growth pattern High nuclear grade cellularity Mitotic rate > 1/50 high power fields Necrosis Vascular invasion |
| Uncertain malignant potential | One of: Nuclear pleomorphism Multinucleated giant cell Size ≥ 5 cm |
| Malignant | Two or more: Size ≥ 5cm Infiltrative growth pattern High nuclear grade cellularity Mitotic rate > 1/50 high power fields Necrosis Vascular invasion |
