Chronic serous mastoiditis and idiopathic hemotympanm are uncommon conditions which have the same symptoms as chronic serous otitis media. They differ in that the middle ear fluid continues to form, either draining out the ventilation tube or blocking it completely so that the tube may become dislodged shortly after surgery.
This persistent fluid formation is due to changes in the mucous membrane of the middle ear and mastoid.
In both of the above conditions, mastoid surgery may be necessary to control the problem and reestablish a normal middle ear mechanism.
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