The cerebellopontine angle (CPA) is delimited by the petrous bone, the cerebellum and the brainstem. A mass lesion at the CPA can result in pressure on cranial nerves and blood vessels, resulting in the CPA Syndrome.


Cranial nerves V to XI may be affected.


Clinical findings resulting from pressure on the 8th cranial nerve:

(1) unilateral hearing loss

(2) tinnitus

(3) vertigo


Other cranial nerve palsies include:

(1) facial nerve palsy

(2) nystagnus

(3) diplopia

(4) vocal cord palsy

(5) dysphagia


Uncontrolled progression of a mass lesion results in respiratory compromise and death.


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