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Disease involving the cerebellopontine angle (CPA) may arise from structures located within the cistern or from extension of lesions located primarily outside the cistern—from the brainstem, fourth ventricle, choroid plexus and bony skull base. The symptoms and signs of CPA disease are non-specific, relating either to compression of the neural structures found within it or from compression of the fourth ventricle with resulting obstructive hydrocephalus. Imaging is vital for diagnosis and management planning. The main features to note are the site of origin, shape, density, signal intensity and pattern of enhancement of the lesion.⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓
▸ A separate version of this paper with much more detail is available on the Practical Neurology website (http://pn.bmj.com/).
Competing interests None.
Provenance and peer review Commissioned; internally peer reviewed.