acoustic neuroma

Question 1

define acoustic neuroma

Answer 1

also called vestibular schwannoma

indolent histologically benign tumour

Question 2

what does acoustic neuroma arises from

Answer 2

schwann cells of the superior vestibular neruve

-hence other name vestibular schwannoma

Question 3

where does acoustic neuroma form

Answer 3

originates in the internal auditory canal

Question 4

causes of acoustic neuroma 2

Answer 4

95% sporadic 5% related to enurofirbomatosis type 2 (NF2)

Question 5

symptoms of acoustic neuroma 5

Answer 5

unilateral hearing loss 70%

unilateral non-pulsatile tinnitus 50%

balance problem 20%

large tumours-> paraesthesia of face -> loss of corneal reflex, headaches, cerebellar dysfunction, facial nerve palsy, raised ICP signs and other cranial nerve palsies

Question 6

issues w acoustic neuroma

Answer 6

as they grow can cause local pressure on auditory, viestibular and facial nerves.

Question 7

tests for acoustic neuroma 3

Answer 7

pure tone audigram and pseech audiogram, MRI scan

Question 8

differentials for acoustic neuroma 4

Answer 8

meningioma

epidermoid tumours

lower nervce schawannomas

arachnoid cysts