Table 2.

Classification of Uterus PEComa

Classification	Criteria
Benign	No worrisome features (Size<5 cm, noninfiltrative, non–high nuclear grade and cellularity, mitotic rate ≤1/ 50 HPF, no necrosis, no vascular invasion)
Uncertain malignant potential	1) Nuclear pleomorphism/multinucleated giant cells only or 2) Size>5cm only
Malignant	Two or more worrisome features 1) Size>5 cm 2) Infiltrative 3) High nuclear grade and cellularity 4) Mitotic rate ≥1/50HPF 5) Necrosis 6) Vascular invasion