This is the accumulation of pus in the extradural space.
It usually occurs in long standing suppurative otitis media, from direct extension of infection from a mastoid, or persinus abscess. The mechanism is the same - infection leads to necrosis and erosion of the dural plate, and subsequent exposure of the dura mater to the infection.
The middle and posterior fossae are most commonly involved.
Features are usually non-specific, including localised pain and tenderness, fever, headache, and signs of meningeal irritation.
Treatment consists of antibiotics and excision of any diseased bone.
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