Table 2 Summary of pathologic features in reported cases of PEComa NOS
Pathologic feature* | Non-Benign cases (n = 12) | Benign cases (n = 25) |
|---|---|---|
Cytologic atypia | 8/10 (80%) | 9/25 (36%) |
Necrosis | 7/11 (64%) | 4/18 (22%) |
Lymphovascular invasion | 4/8 (50%) | 1/11 (9.1%) |
Size (average diameters) | 7.5 cm (n = 11) | 4.54 cm (n = 24) |
Significant mitotic activity (6 mitoses per 10 high power fields or greater | 3/10 (30%) | 0/24 (0%) |