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Tumours of Cerebellopontine Angle

Question
8 out of 18
 

Acoustic neuroma causes:



A Cochlear deafness
B Retrocochlear deafness

C Conductive deatness
D Any of the above

Ans. B Retrocochlear deafness

• SNHL can be:

a. Cochlear SNHL - Hair cells are mainly damaged.

b. Retrocochlear SNHL - There is lesion of VI 11th nerve or its central connections.

Acoustic neuroma cause retrocochlear type of SNHL as it damages Vlll" nerve.

Meniere's disease causes cochlear deafness

• Important features of Retro Cochlear hearing loss / Acoustic Neuroma:

- Sensorineural hearing loss more marked in high frequencies.

- Poor discrimination score (0-30%).

- Recruitment phenomenon absent and rollover phenomenon present . discrimination score further decreases when loudness is increased beyond a particular point.

- Short increment sensitivity index (SISI) test will show a score of 0-20% in 70-90% cases.

- Tone decay significant

Tumours of Cerebellopontine Angle Flashcard List

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