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Washington University Experience | NEOPLASMS - CRANIAL AND PARASPINAL NERVEs | Perineurioma, Intraneural | 9D3 Perineurioma (Case 9) S100 6
S100 immunoreactive elements are not part of the neoplasm, rather they represent included Schwann cells of normal axons and cells which have lost their axons (S100 IHC)