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Washington University Experience | NEOPLASMS - CRANIAL AND PARASPINAL NERVEs | Perineurioma, Intraneural | 6E2 Perineurioma (Case 6) S100 1
S100 immunoreactivity is found in Schwann cells within the perineurioma but does not involve the neoplastic perineurioma elements themselves (S100 IHC)