Table 1.
Schwannoma presentatios: 5 The most common Antoni A and Antoni B.
| Classic schwannoma (vestibular) | Cellular schwannoma (paravertebral region) | |
|---|---|---|
| Antoni A | Antoni B | Compact hypercellular Antoni A pattern areas with no Verocay bodies |
| Hypercellular spindle cell pattern | Hypocellular myxomatous pattern | High cellularity, mitotic rate suggestive of malignancy, and fascicular growth pattern |
| Palisading around eosinophilic areas (Verocay bodies) | Presence of loose connective tissue | Key to the diagnosis of hystiocytic aggregate and high expression of pericellular type IV collagen |
| Positive S100 protein staining | Presence of cyst, hemorrhage, fatty degeneration, scarce calcifications | Poorly expressed desmin, smooth muscle actin, and CD117 |