====== Cerebellopontine angle pilocytic astrocytoma ======
A rare case of a 55-yr old patient of [[pilocytic astrocytoma]] of the [[cerebellopontine angle]] mimicking a [[vestibular schwannoma]]. The tumor protruded into the [[porus acusticus]] causing enlargement of the [[internal auditory meatus]], which is quite an unusual feature of [[glial tumor]]
((Dutta G, Singh D, Singh H, Sachdeva D, Kumar V, Chaturvedi A. Pilocytic
astrocytoma of the cerebellopontine angle mimicking vestibular schwannoma: report
of a rare entity. Br J Neurosurg. 2017 Dec 26:1-3. doi:
10.1080/02688697.2017.1419163. [Epub ahead of print] PubMed PMID: 29278012.
)).
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Schneider et al. report a pilocytic astrocytoma of the cerebellopontine angle in a child presenting with [[auditory neuropathy spectrum disorder]]
((Schneider F, Kompis M, Ozdoba C, Beck J, Caversaccio M, Senn P. Pilocytic
astrocytoma of the cerebellopontine angle in a child presenting with auditory
neuropathy spectrum disorder. Otol Neurotol. 2015 Apr;36(4):e101-3. doi:
10.1097/MAO.0000000000000355. PubMed PMID: 24781101.)).
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Mirone et al. describe a rare case of pediatric [[pilocytic astrocytoma]] presented as a right [[cerebellopontine angle]] (CPA) mass, completely separated from the [[brainstem]] and arising from the proximal [[VIII cranial nerve]] portion.

A 12-year-old boy, with no evidence of [[neurofibromatosis type 2]], presented with progressive [[hearing loss]] at the right ear and [[headache]]. An initial enhanced magnetic resonance examination suggested the diagnosis of [[schwannoma]]. The tumor was resected by a [[suboccipital]] [[retrosigmoid approach]].

The case seems to be the first report of a primary pediatric CPA pylocitic astrocytoma arising from the VIII nerve complex and presenting [[internal auditory canal]] enlargement. It represents the third reported case of a primary CPA pilocytic astrocytoma (the second pediatric case with the first arising from V nerve) and the eighth report of primary CPA glioma, overall
((Mirone G, Schiabello L, Chibbaro S, Bouazza S, George B. Pediatric primary
pilocytic astrocytoma of the cerebellopontine angle: a case report. Childs Nerv
Syst. 2009 Feb;25(2):247-51. doi: 10.1007/s00381-008-0690-9. Epub 2008 Aug 9.
PubMed PMID: 18690462.
)).
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A case of pilocytic astrocytoma of the cerebellum mimicking an acoustic schwannoma. The tumour protruded into the porus acusticus and enlarged the internal auditory meatus, which is a quite unusual characteristic of glial tumours
((Takada Y, Ohno K, Tamaki M, Hirakawa K. Cerebellopontine angle pilocytic
astrocytoma mimicking acoustic schwannoma. Neuroradiology. 1999
Dec;41(12):949-50. PubMed PMID: 10639675.
)).