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Facial nerve and its disorders

Question
15 out of 33
 

Which fracture of the petrous bone will cause facial nerve palsy:



A Longitudinal fractures

B Transverse fractures

C Mastoid

D Facial nerve injury is always complete

Ans. B Transverse fracture

Fracture of petrous temporal bone can be longitudnal or transverse. Facial palsy is seen more often with transverse fracture",

Longitudnal

Transverse

Frequency

Bleeding from ear

Csf otorrhoea

Structures injured

Hearing loss

Facial paralysis

Onset of paralysis

Part of facial nerve injured

Vertigo

Most common (80%)

Present

Present

Tegmen, ossicles and TympanicMembrane

Conductive

Less common, (10% cases)

Delayed onset paralysis

Distal to geniculate ganglion

Less often

Less common (20%)

Absent (as tympanic membrane is intact)

Absent

Labyrinth or CN VIII

SNHL

More common (40-50%)

Immediate onset of paralisis

Proximal to geniculate ganglion

More often

In these cases it is important to know whether paralysis was of immediate or delayed onset-

Immediate onset paralysis is treated conservatively.

Delayed onset paralysis - requires surgery in the form of decompression, reanastomosis of cut ends or cable nerve grafts.

Facial nerve and its disorders Flashcard List

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