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CP Angle Tumor

Cerebellopontine angle (CPA) tumors are mostly benign and occur in the posterior fossa. They account for 5-10% of intracranial  tumors.

Cerebellopontine angle (CPA) tumors include:

  • Vestibular schwannomas (acoustic neuromas)

  • Lipomas

  • Vascular malformations

  • Hemangiomas

  • Meningiomas

  • Epidermoids

  • Facial or lower cranial nerve schwannomas


Cause of Cerebellopontine angle (CPA) tumors

The specific cause of CPA tumor is not known but they are linked with the genetic disorder neurofibromatosis type 2 (NF2).

Symptoms of Cerebellopontine angle (CPA) tumors

The symptoms depend upon the size and location of the lesion and may include any of the following:

  • Hearing loss (most commonly unilateral)

  • Tinnitus (ringing sounds in ear)

  • Vertigo/unsteadiness/disequilibrium

  • Headache

  • Facial hypesthesia

  • Decreased facial sensation

  • Facial weakness and spasm

  • Diplopia

  • Blurry vision

Diagnosis of Cerebellopontine angle (CPA) tumors

The diagnosis CPA tumors start with the evaluation of patient symptoms followed by a thorough physical and neurological examination of the patient. Subsequently, following tests are performed to confirm the diagnosis:

  • Hearing test (audiology)

  • Test of equilibrium and balance (electronystagmography)

  • Test of hearing and brainstem function (brainstem auditory evoked response)

  • CT scan

  • MRI

  • Gd-enhanced MRI gold standard

Authored By Dr. Manish Vaish

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