A mastoidectomy is a surgical procedure that removes an infected portion of the mastoid bone when medical treatment is not effective.
A mastoidectomy is performed to remove infected mastoid air cells resulting from ear infections, such as mastoiditis or chronic otitis, or by inflammatory disease of the middle ear (cholesteatoma). The mastoid air cells are open spaces containing air that are located throughout the mastoid bone, the prominent bone located behind the ear that projects from the temporal bone of the skull. The air cells are connected to a cavity in the upper part of the bone, which is in turn connected to the middle ear. Aggressive infections in the middle ear can thus sometimes spread through the mastoid bone. When antibiotics can't clear this infection, it may be necessary to remove the infected area by surgery. The primary goal of the surgery is to completely remove infection so as to produce an infection-free ear. Mastoidectomies are also performed sometimes to repair paralyzed facial nerves.
According to the American Society for Microbiology, middle ear infections increased in the United States from approximately three million cases in 1975 to over nine million in 1997. Middle ear infections are now the second leading cause of office visits to physicians, and this diagnosis accounts for over 40% of all outpatient antibiotic use. Ear infections are also very common in children between the ages of six months and two years. Most children have at least one ear infection before their eighth birthday.
A mastoidectomy is performed with the patient fully asleep under general anesthesia. There are several different types of mastoidectomy procedures, depending on the amount of infection present:
After surgery, the wound is stitched up around a drainage tube and a dressing is applied.
The treating physician gives the patient a thorough ear, nose, and throat examination and uses detailed diagnostic tests, including an audiogram and imaging studies of the mastoid bone using x rays or CT scans to evaluate the patient for surgery.
The patient is prepared for surgery by shaving the hair behind the ear on the mastoid bone. Mild soap and a water solution are commonly used to cleanse the outer ear and surrounding skin.
The drainage tube inserted during surgery is typically removed a day or two later.
Painkillers are usually needed for the first day or two after the operation. The patient should drink fluids freely. After the stitches are removed, the bulky mastoid dressing can be replaced with a smaller dressing if the ear is still draining. The patient is given antibiotics for several days.
The patient should inform the physician if any of the following symptoms occur:
Complications do not often occur, but they may include:
The outcome of a mastoidectomy is a clean, healthy ear without infection. However, both a modified radical and a radical mastoidectomy usually result in less than normal hearing. After surgery, a hearing aid may be considered if the patient so chooses.
In the United States, death from intracranial complications of cholesteatoma is uncommon due to earlier recognition, timely surgical intervention, and supportive antibiotic therapy. Cholesteatoma remains a relatively common cause of permanent, moderate, and conductive hearing loss.
Alternatives to mastoidectomy include the use of medications and delaying surgery. However, these alternative methods carry their own risk of complications and a varying degree of success. Thus, most physicians are of the opinion that patients for whom mastoidectomy is indicated should best undergo the operation, as it provides the patient with the best chance of successful treatment and the lowest risk of complications.
See also Tympanoplasty .
Fisch, H. and J. May. Tympanoplasty, Mastoidectomy, and Stapes Surgery. New York: Thieme Medical Pub., 1994.
Cristobal, F., Gomez-Ullate, R., Cristobal, I., Arcocha, A., and R. Arroyo. "Hearing results in the second stage of open mastoidectomy: A comparison of the different techniques." Otolaryngology - Head and Neck Surgery 122 (May 2000): 350-351.
Garap, J. P., and S. P. Dubey. "Canal-down mastoidectomy: experience in 81 cases." Otology & Neurotology 22 (July 2001): 451-456.
Jang, C. H. "Changes in external ear resonance after mastoidectomy: open cavity mastoid versus obliterated mastoid cavity." Clinical Otolaryngology 27 (December 2002): 509-511.
Kronenberg, J., and L. Migirov. "The role of mastoidectomy in cochlear implant surgery." Acta Otolaryngologica 123 (January 2003): 219-222.
American Academy of Otolaryngology-Head and Neck Surgery, Inc. One Prince St., Alexandria VA 22314-3357. (703) 836-4444. http://www.entnet.org .
American Hearing Research Foundation. 55 E. Washington St., Suite 2022, Chicago, IL 60602. (312) 726-9670. http://www.american-hearing.org/ .
Better Hearing Institute. 515 King Street, Suite 420, Alexandria, VA 22314. (703) 684-3391.
"Mastoidectomy series." MedlinePlus. http://www.nlm.nih.gov/medlineplus/ency/presentations/100032_1.htm .
Carol A. Turkington
Monique Laberge, Ph.D.
An mastoidectomy is performed in a hospital by surgeons specialized in otolaryngology, the branch of medicine concerned with the diagnosis and treatment of disorders and diseases of the ears, nose and throat. The procedure usually takes between two and three hours. It is occasionally performed on an outpatient basis in adults but usually involves hospitalization.