Cerebellopontine angle mass = Vestibular schwannoma (AKA acoustic neuroma). Derived from Schwann cells, which are of neural crest origin.

COPS: CNS = Oligodendrocytes, PNS = Schwann cells.

Neuroepithelia in neural tube—CNS neurons, ependymal cells (inner lining of ventricles, make CSF), oligodendrocytes, astrocytes. Neural crest—PNS neurons, Schwann cells, glia, melanocytes, adrenal medulla.

In CNS (including CN II), myelin is synthesized by oligodendrocytes; in PNS (including CN III-XII), myelin is synthesized by Schwann cells.

Since CP angle mass is a vestibular schwannoma, it arose from Neural Crest cells.

Going over other choices (FA 19 514): Oligodendrocytes are part of the CNS so a tumor there would be an oligodendroglioma which is relatively rare, and in frontal lobes. On histology you would see fried egg appearance with chicken wire capillaries. Glioblast tumor would be a glioblastoma multiforme which is common and has a 1 year survival, its the one with the butterfly glioma crossing the corpus callosum.