2. COMPLICATIONS OF OTITIS MEDIA
INTRA TEMPORAL
• Mastoiditis
• Petrositis
• Facial paralysis
• Labyrinthitis
INTRA CRANIAL
• Extra dural abscess
• Subdural abscess
• Meningitis
• Otogenic brain abscess
• Lat. Sinus
thrombophlebitis
• Otitic hydrocephalus
3. OTOGENIC BRAIN ABSCESS
In adults
Usually follows CSOM with cholesteatoma
In children
As a result of acute otitis media
4. ROUTES OF INFECTION
• Direct extension of ME infection through tegmen
• Retrograde thrombophlebitis
Cerebral
abscess
• Direct extension through Trautmann’s triangle
• Retrograde thrombophlebitis
Cerebellar
abscess
8. PATHOLOGY
STAGE OF INVASION
• Head ache ,low grade fever
STAGE OF LOCALIZATION
• No symptoms
• Localize the pus by formation of capsule
STAGE OF ENLARGEMENT
• Abscess began to enlarge
• Zone of edema -aggravation of symptoms
STAGE OF TERMINATION
Ruptures into ventricle /sub arachnoid space
fatal meningitis
9.
10. CLINICAL FEATURES
THOSE DUE TO RAISED INTRACRANIAL TENSION
Headache-worse in the morning
Nausea & vomiting
Level of conciousness
lethargy drowsiness confusion stupor coma
Papilloedema
Slow pulse & subnormal temperature
11. LOCALIZING FEATURES
Temporal lobe abscess
Nominal aphasia
Homonymous hemianopia: pressure on optic
radiation
Contralateral motor paralysis:
upward spread- face arm leg
Inward spread - leg arm face
Epileptic fits
Pupillary changes & oculomotor palsy
13. INVESTIGATIONS
Skull X-rays
CT scan
o site &size of the lesion
o reveals associated complications
X -ray mastoids or CT scan of temporal
bone
Lumbar puncture : CSF shows-
rise in pressure
protein content
WBC Count
polymorphs/lymphocytes
14. TREATMENT
MEDICAL
High doses of antibiotics parenterally
o Mixed infections:
o chloramphenicol+ 3rd gen.cephalosporins
o Bacteroides fragilis : metronidazole
o Pseudomonas/proteus : aminoglycosides
ICT--Dexamethasone 4 mg iv 6 hrly /
mannitol 20% in doses of .5g/kg body wt
Discharge from ear-Suction clearence & topical ear drops
15. NEUROSURGICAL
Abscess can be approached in
following ways :
Repeated aspiration through a
burr hole
Excision of abscess
Open incision of the abscess
&evacuation of pus
24. Head ache
Progressive anaemia
& emaciation
Griesinger’s sign
- due to thrombosis
of mastoid emissary
vein
25. Papilloedema
its presence depends
on obstruction to
venous return.
Tobey –Ayre’s test
Record CSF pressure by
manometer
26.
27. Crowe -beck test
Pressure on jugular vein of healthy side
engorgement of retinal veins & supra orbital veins
Tenderness along jugular vein
28. INVESTIGATIONS
Blood smear : to rule out malaria
Blood culture : to find out causative organisms
CSF examination : shows rise in pressure
X ray mastoid :
clouding of cells - acute mastoiditis
destruction of bone – cholesteatoma
31. TREATMENT
IV antibacterial therapy:
should be continued at least for a week after the
operation
Mastoidectomy & exposure of sinus:
complete cortical/modified radical
mastoidectomy
Sinus bony plate is removed to expose the dura
& drain the perisinus abscess
32.
33.
34. Ligation of internal jugular vein
Anticoagulant therapy:
used when thrombosis is extending to cavernous
sinus
Supportive treatment:
Repeated blood transfusions