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Cerebellopontine angle tumor

The cerebellopontine angle (CPA) is a triangular space located posterior to the pyramid, inferior to the tentorium, lateral to the pons, and ventral to the cerebellum. It is formed by the superior and inferior limbs of the cerebellopontine fissure. The CPA is occupied by the CPA cistern, which includes the trigeminal, abducent, facial, and vestibulocochlear nerves, the superior cerebellar and anterior inferior cerebellar arteries, the flocculus of the cerebellum, and the choroid plexus that protrudes through the foramen of Luschka (Rhoton, 2000). Presenting symptoms of CPA tumors (including acoustic neuromas) include the following: • Hearing loss - 95% • Tinnitus (ringing or buzzing noise in the ear) - 80% • Vertigo/unsteadiness (a sensation of feeling off balance) - 50-75% • Headache - 25% • Facial hypesthesia (numbness or decrease in normal sensation) - 35-50% • Diplopia (double vision) - 10%. NB: Presenting symptoms can vary according to the size and location of the lesion. Assessment The diagnosis of CPA tumors is made based on • History • Physical examination • Audiometric and radiological evaluation. • Magnetic resonance image (MRI) is the gold standard for the diagnosis of CPA tumors. • High-resolution computed tomography (CT) is useful for the assessment of bony involvement.