Where is cerebellopontine angle located?
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.
What is Pontocerebellar angle syndrome?
neurology. 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 is the cerebellopontine angle tumor?
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 are the main clinical signs of a tumor of the cerebellopontine angle?
The most common presenting symptoms of lesions involving the CPA include hearing loss, tinnitus, dizziness, vertigo, headaches, and gait dysfunction. Hearing loss is mostly unilateral sensorineural and is due to the involvement of the cochlear nerve.
What does the cerebellopontine angle do?
The cerebellopontine angle is formed by the cerebellopontine fissure. This fissure is made when the cerebellum folds over to the pons, creating a sharply defined angle between them. The angle formed in turn creates a subarachnoid cistern, the cerebellopontine angle cistern.
What is cerebellopontine angle meningioma?
Introduction. 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 is jugular foramen syndrome?
The jugular foramen syndrome (JFS or Vernet syndrome) refers to paralysis of the IX, X, and XI cranial nerves traversing the jugular foramen. Vernet first described it in the Paris Medical Journal (1917).
What is Retrosigmoid approach?
The suboccipital craniotomy (also called retrosigmoid) involves removing a portion of the occipital bone behind the ear to remove the tumor (Fig. 1). Figure 1. The suboccipital approach involves removing a portion of the bone behind the ear. The cerebellum is gently held back to remove the acoustic neuroma.
Can a meningioma cause hearing loss?
Hearing loss – Meningiomas can cause hearing loss if the tumor affects the inner ear or the nerve that controls hearing. Changes in thinking or personality – People with large meningiomas may have subtle or even dramatic changes in their personality or thinking.
Where are schwannomas located?
Schwannomas can be found in the sheath that covers the nerves. They are found in the peripheral nervous system, cranial nerves or the root of a nerve and not in the brain or spinal cord. A common area for schwannomas is the nerve connecting the brain to the inner ear.
What is CPA meningioma?
Introduction. Cerebellopontine angle (CPA) meningiomas account for 1.5% of intracranial meningiomas and dominated (58.3%) in a series of meningiomas of the posterior skull base [1-2]. Of all CPA tumors, meningiomas are the second-most frequent tumor in this area .
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).
Where is the cerebellopontine angle located in the body?
The cerebellopontine angle ( CPA) ( Latin: angulus cerebellopontinus) is located between the cerebellum and the pons. The cerebellopontine angle is the site of the cerebellopontine angle cistern one of the subarachnoid cisterns that contains cerebrospinal fluid, arachnoid tissue, cranial nerves,…
Can a cyst on the cerebellopontine angle be repaired?
Bilateral arachnoid cysts of the cerebellopontine angle are very infrequent and the main indication for surgery is the existence of clinical symptoms or neurological deficit coincident with the locations of the cysts .
Can a child have a cerebellopontine angle tumor?
Cerebellopontine angle tumors in infants and children A plethora of tumor types occur in childhood at the CPA/CMF and our review indicated 50 % were benign in histology. High rates of lower cranial nerve morbidity were experienced but their dysfunctions were often recovered or compensated in 2 years.
Where do tumors originate in the cerebellopontine?
Tumors Originating in the CPA. The CPA is outlined by the meninges of the cerebellopontine cistern; thus, in addition to cerebrospinal fluid (CSF), the CPA contains nerves and arteries and possibly embryologic remnants. Each of these structures can be the site of origin of an unusual CPA lesion.