What is CPA in the brain?
Cerebellopontine angle tumors (CPAs) occur between the lower part of the brain and the brain stem. Most CPAs are benign, but can cause nerve damage or compress the brain stem if not treated.
Where is the CP angle in the brain?
The CP angle is a triangular space located posterior to the pyramid, inferior to the tentorium, lateral to the pons, and ventral to the cerebellum. It is defined by the superior and inferior limbs of the CP fissure (Fig.
Where is a CPA tumor located?
Cerebellopontine angle (CPA) tumors are the most common neoplasms in the posterior fossa, accounting for 5-10% of intracranial tumors. Most CPA tumors are benign, with over 85% being vestibular schwannomas (acoustic neuromas), lipomas, vascular malformations, and hemangiomas.
What is the most common tumor of the cerebellopontine angle?
Acoustic neuromas (vestibular schwannomas) are benign Schwann cell tumors that typically arise from the vestibular portion of the eighth cranial nerve. The acoustic neuroma is the most common tumor of the cerebellopontine angle.
What is CPA surgery?
Endoscopic surgical techniques in the cerebellopontine angle (CPA) have improved visualization of the tumor and adjacent structures. Stereotactic methods have improved accuracy of the delivery of microsurgical dissection and radiation therapy, thus minimizing damage to adjacent tissue.
What is a CP angle lesion?
Lesions in the area of cerebellopontine angle cause signs and symptoms secondary to compression of nearby cranial nerves, including cranial nerve V (trigeminal), cranial nerve VII (facial), and cranial nerve VIII (vestibulocochlear).
What is CP angle meningioma?
Cerebellopontine angle meningiomas account for 6–15% of the tumors in the cerebellopontine angle region (1). They are characterized by the deep tumor location, narrow surgical field, and proximity to the brainstem, multiple pairs of (V–XI) cranial nerves (2).
What are the main clinical signs of a tumor of the cerebellopontine angle?
The cerebellopontine angle syndrome is a distinct neurological syndrome of deficits that can arise due to the closeness of the cerebellopontine angle to specific cranial nerves. Indications include unilateral hearing loss (85%), speech impediments, disequilibrium, tremors or other loss of motor control.
What are the symptoms of a tumor behind the ear?
- Hearing loss, usually gradually worsening over months to years — although in rare cases sudden — and occurring on only one side or more severe on one side.
- Ringing (tinnitus) in the affected ear.
- Unsteadiness or loss of balance.
- Dizziness (vertigo)
- Facial numbness and weakness or loss of muscle movement.
What are the main clinical signs of a tumor of the cerebellar pontine angle?
The most common presenting symptoms of lesions involving the CPA include hearing loss, tinnitus, dizziness, vertigo, headaches, and gait dysfunction.
What is CPA in CT scan?
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.