Medical Definition of cerebellopontine angle
: a region of the brain at the junction of the pons and cerebellum that is a frequent site of tumor formation The most common causes of secondary trigeminal neuralgia are multiple sclerosis and acoustic neuroma; tumors and cysts in the cerebellopontine angle may also cause trigeminal neuralgia.— Emad Eskandar et al., The New England Journal of Medicine, 13 July 2006
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