Mastoiditis is an inflammation or infection of the mastoid bone. This bone is one of the bones in the head. It is located behind the ear.
Mastoiditis is a serious infection in the mastoid process, which is the hard, prominent bone just behind and under the ear. Ear infections that people fail to treat cause most cases of mastoiditis. The condition is rare but can become life-threatening without treatment.
Chronic otitis media describes some long-term problems with the middle ear, such as a hole perforation in the eardrum that does not heal or a middle ear infection otitis media that doesn't improve or keeps returning. The middle ear is a small bony chamber with three tiny bones — the malleus, incus and stapes — covered by the eardrum tympanic membrane. Sound is passed from the eardrum through the middle ear bones to the inner ear, where the nerve impulses for hearing are created.
Timothy C. Hain, MD Page last modified: May 25, Mastoiditis is an inflammation or infection of the sinus behind the middle ear Mastoid sinus. This can be often seen on imaging studies such as MRI see below.
Back to Health A to Z. Mastoiditis is a serious bacterial infection that affects the mastoid bone behind the ear. It's more common in children.
Mastoiditis is a bacterial infection in the mastoid process, which is the prominent bone behind the ear. Mastoiditis usually occurs when untreated or inadequately treated acute otitis media spreads from the middle ear into the surrounding bone—the mastoid process. Most mastoid infections are caused by pneumococcus bacteria.
One of the most important structures in your inner ear is the mastoid bone. The mastoid must receive air from other parts of the ear, including the eustachian tubeto function properly. Your eustachian tube connects your middle ear to the back of your throat.
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Mastoiditis is the result of an infection that extends to the air cells of the skull behind the ear. Specifically, it is an inflammation of the mucosal lining of the mastoid antrum and mastoid air cell system inside  the mastoid process. The mastoid process is the portion of the temporal bone of the skull that is behind the ear.
Mastoiditis is a bacterial infection that affects the mastoid, a delicate bone behind the ear and is the rarest of all ear infections. Its structure is similar to that of a honeycomb, helping to maintain air space in the middle ear. When it becomes infected or inflamed, the porous bone begins to break down, causing visible swelling.