Table 3.
Immunohistochemical results
| Case No. | INI1 | Vim | AE1–AE3 | EMA | CD99* | SMA | MSA | S100 | Syn | NSE | Des | CD34 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Nuclear loss | + | + | + | − | − | + (focal) | − | ND | − | − | ND |
| 2 | Nuclear loss | ± | + (focal) | − | − | + (focal) | + (focal) | + (focal) | − | − | − | − |
| 3 | Nuclear loss | + | ± | + (focal) | + | + | + | − | − | ± | − | − |
| 4 | Nuclear loss | + | + | + | − | + | ND | − | − | + (focal) | − | + (focal) |
| 5 | Nuclear loss | + | + | + | + | − | − | + | − | ND | ND | − |
Des, desmin; EMA, epithelial membrane antigen; MSA, muscle specific actin; NSE, neuron specific enolase; SMA, smooth muscle actin; Syn, synaptophysin; Vim, vimentin.
+: positivity in 25% of cells or more; + (focal): positivity in less than 25% of cells; +/−: weak staining of uncertain specificity; ND: not done. CD99*: Only perimembranous staining considered positive.