inner ear diseases

Question 1

what are the different inner ear diseases?

Answer 1

presbycusis
drug-induced
vestibular schwannoma
trauma

Question 2

what is presbycusis?

Answer 2

degenerative hearing loss due to loss of outer hair cells, ganglion cells and strial atrophy
high pitched sensory hearing loss - dip at 4kHz from trauma (concerts etc)

Question 3

what drugs can cause hearing loss?

Answer 3

gentamicin
chemo drugs
aspirin/NSAIDs

Question 4

what is vestibular schwannoma?

Answer 4

benign tumour of inner auditory meatus of CN VIII nerve sheath

Question 5

what are the signs of vestibular schwannoma?

Answer 5

tinnitus
insidious unilateral hearing loss
imbalance

Question 6

why is vertigo an unlikely symptom of vestibular schwannoma?

Answer 6

as tumour is slow growing

Question 7

what bone is affected in trauma that leads to hearing loss?

Answer 7

crack through temporal bone

Question 8

what is the sign of crack through temporal bone?

Answer 8

bruising behind ear (battle’s sign)