An<unk>  is a rare benign tumor within the sheath of a single nerve that grows but typically does not recur or metastasize. These lesions are only composed of perineurial cells, cloned from a single cell. They are distinct from schwannoma and neurofibroma.<unk>  is a neoplastic proliferation of perineurial cells with unique immunohistochemistry and ultrastructural features, and it is distinct from other onion bulb Schwann cell-derived entities. Despite harboring molecular abnormalities of the long arm of chromosome 22,<unk>  has not been associated with neurofibromatosis."
Intraneural perineurioma
Diffuse intrinsic pontine glioma
Fibrillary astrocytoma
Subependymal giant cell astrocytoma
Ganglioglioma
Schwannoma
Subependymoma
Diktyoma