Table 2. Hematoxylin and eosin staining and immunohistochemistry results of 9 patients with PMME.
| Case | Sample type | H&E | HMB45 | S-100 | Melan-A | CK |
|---|---|---|---|---|---|---|
| 1 | Resected | Melanosis | + | + | + | − |
| 2 | Resected | Melanosis | + | + | + | − |
| 3 | Biopsy | Melanosis | + | − | + | − |
| 4 | Biopsy | Melanosis | + | + | + | − |
| 5 | Resected | Melanosis | + | + | + | − |
| 6 | Biopsy | Melanosis | + | + | + | − |
| 7 | Biopsy | Melanosis | + | + | + | − |
| 8 | Resected | Melanosis | + | + | + | − |
| 9 | Resected | Melanosis | + | + | + | − |
H&E, hematoxylin and eosin staining; HMB45, human melanin black 45; CK, cytokeratin; +, positive; −, negative.