Table. 2 Morphological features of diffuse malignant epithelioid peritoneal mesothelioma
Architectural pattern | N (%) |
|---|---|
‑ Tubulopapillary | 6 (18%) |
‑ Trabecular | 1 (3%) |
‑ Microcystic | 1 (3%) |
‑ Solid | 25 (73%) |
‑ Micropapillary | 1 (3%) |
Cytological features | |
‑ Epithelioid | 28 (82%) |
‑ Deciduoid | 6 (18%) |
Stromal features | |
‑ Non reactive | 27 (79%) |
‑ Desmoplastic | 6 (18%) |
‑ Myxoid | 1 (3%) |
Nuclear atypia | |
‑ 1 | 0 |
‑ 2 | 16 (47%) |
‑ 3 | 18 (53%) |
Mitotic count | |
‑ 1 (≤ 1/2 mm2) | 1 (3%) |
‑ 2 (2–4/2 mm2) | 15 (44%) |
‑ 3 (≥ 5/2 mm2) | 18 (53%) |
Necrosis | |
‑ Present | 12 (35%) |
‑ Absent | 22 (65%) |
Grade | |
‑ Low | 15 (44%) |
‑ High | 19 (56%) |