Mastoiditis is a bacterial infection in the mastoid process, which is the prominent bone behind the ear.
This disorder 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. Inadequately treated mastoiditis can result in deafness, blood poisoning (sepsis), infection of the tissues covering the brain (meningitis), brain abscess, or death.
Usually, symptoms appear days to weeks after acute otitis media develops, as the spreading infection destroys the inner part of the mastoid process. A collection of pus (abscess) may form in the bone. The skin covering the mastoid process may become red, swollen, and tender, and the external ear is pushed sideways and down. Other symptoms are fever, pain around and within the ear, and a creamy, profuse discharge from the ear. The pain tends to be persistent and throbbing. Hearing loss can become progressively worse.
Doctors typically base the diagnosis on the person's symptoms. Sometimes doctors do a CT scan to confirm the diagnosis. To identify the bacteria causing the infection, doctors take samples of the discharge from the ear so that the bacteria in the discharge can be grown in a laboratory (cultured).
Most people are immediately given an antibiotic (such as ceftriaxone) by vein. People who are not seriously ill may instead be given a fluoroquinolone antibiotic (such as ciprofloxacin) by mouth. After this initial treatment, doctors use the results of the laboratory culture to determine the best antibiotic to use. Antibiotics may be given by mouth once the person starts to recover and are also continued for at least 2 weeks. If an abscess has formed in the bone, surgical drainage (mastoidectomy) is required.