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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:
- HVestibular 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
Treatments :
Treatment for lesions of cerebellopontine angle (CPA) tumor depends upon its severity, size and involvement of adjacent structures.
It may include any of the following:
- Medical therapy: Some patients are given diuretics to provide symptomatic relief.
- Observation with serial imaging
- Stereotactic Radiosurgery
- Radiation therapy
- Surgery
- Chemotherapy
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