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Diseases of The Ear

Question
12 out of 24
 

Malignant otitis externa is characterized: [PGI Dec 2012]



A Caused by pseudomonas aeruginosa

B Malignancy of external auditory canal

C Granulation tissue is seen in the floor of extra auditory canal

D Radiotherapy can be given

E Gallium scan is helpful for monitoring treatment

Ans. A & C and E Caused by pseudomonas aeruginosa; Granulation tissue is seen inthe floor of external auditory canal; and Gallium scan helpful for monitoring treatment

Ref. Dhingra 5th/ed pg 58, 6th/ed p 52 Scott's Brown 7th/ed vol 3 pg 3336-3339; Harrison 7 7th/ed pg 208

Malignant Otitis Externa : Brief summary

It is an inflammatory condition of external ear,?

Most commonly caused by Pseudomonas.

Other organisms responsible are: S. aureus, S. epidermidis, Aspergillus, Actinomyces.

Seen in elderly diabetics Q /immuno compromised patients Q /patients on immunosuppressive drug. Q

Called as malignant because it behaves like a tumor in causing destruction of tissues of canal and pre and post auricular region

by various enzymes. Q

Characterised by presence of granulation tissue in external auditory canal Q, at the junction of bony and cartilaginous part. Q

It is very painful

It can spread to base of skull and temporal bone (causing osteomyelitis of temporal bone).

As the infection spreads to temporal bone, and base of skull, it may involve cranial nerves (most common being facial nerve).

Gold standard for diagnosis: positive technetium 99 bone scan.

Treatment: high dose IV antibiotics

DOC

Cefepime lteftazidine (3rd generation cephalosporin).

Antipseudomonal penicillin with an aminoglycoside f.f1uoroquinolone.

Diseases of The Ear Flashcard List

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