Neoplasms which arise from nerve sheaths formed by SCHWANN CELLS in the PERIPHERAL NERVOUS SYSTEM or by OLIGODENDROCYTES in the CENTRAL NERVOUS SYSTEM. Malignant peripheral nerve sheath tumors, NEUROFIBROMA, and NEURILEMMOMA are relatively common tumors in this category.

Synonyms: Nerve Sheath Neoplasm, Tumor, Nerve Sheath, Perineuriomas, Perineurioma, Sheath Tumor, Nerve, Sheath Tumors, Nerve, Nerve Sheath Neoplasms, Nerve Sheath Tumor, Tumors, Nerve Sheath, Nerve Sheath Tumors, Peripheral, Peripheral Nerve Sheath Tumors, Neoplasm, Nerve Sheath, Neoplasms, Nerve Sheath, Nerve Sheath Tumors, Peripheral Nerve Sheath Tumor, Tumors of the Nerve Sheath