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Mastoiditis is a serious bacterial infection that affects the mastoid bone behind the ear. It's usually more common in children, although adults can also sometimes be affected. The mastoid bone has a honeycomb-like structure that contains air spaces called mastoid cells.
an infection of one of the mastoid bones, usually an extension of a middle ear infection. It is characterized by earache, fever, headache, and malaise. Swelling of the mastoid process often displaces the pinna anteriorly and inferiorly.escription. The mastoid is a part of the side (temporal bone) of the skull. It can be felt as a bony bump just behind and slightly above the level of the earlobe.