Cerebellopontine angle is the region where petrosal surface of cerebellum wraps around the pons and upper medulla with the middle cerebellar peduncle being its floor .
CPA is formed by superior and inferior limbs of cerebellopontine fissure with the apex oriented laterally .
It is the site for 8 to 10 % of intracranial tumor.
Most common tumor at this area are Vestibular Schwannoma (80 to 90 %) , Meningioma and Epidermoid cyst.
Anatomy of CPA can be conceptualized by breaking down various neurovasculature into 3 complexes .
Upper complex consists of V CN , superior cerebellar artery and petrosal vein.
Middle coplex consists of VII and VIII CN complex and Anterior Inferior Cerebellar Artery (AICA) and its surgically important 3 branches internal auditary artery ( labyrinthine artery ) , the recurrent perforating artery and subarcuate artery .
Lower complex consists of IX X XI CN complex and Posterior Infereior cerebellar artery. ( PICA)
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