Cholesteatoma is a type of skin cyst that is located in the middle ear and mastoid bone in the skull.
Cholesteatoma can be a birth defect (congenital). It more commonly occurs as a result of chronic ear infection.
The eustachian tube helps equalize pressure in the middle ear. When it is not working well, negative pressure can build up and pull part of the eardrum (tympanic membrane) inward. This creates a pocket or cyst that fills with old skin cells and other waste material.
The cyst may become infected or get bigger. This can cause the breakdown of some of the middle ear bones or other structures of the ear. This can affect hearing, balance, and possibly the function of the facial muscles.
Exams and Tests
An ear exam may show a pocket or opening (perforation) in the eardrum, often with drainage. A deposit of old skin cells may be seen with a microscope or an otoscope, which is a special instrument to view the ear. Sometimes a group of blood vessels may be seen in the ear.
The following tests may be performed to rule out other causes of dizziness:
- CT scan
Cholesteatomas very often continue to grow if they are not removed. Surgery is most often successful. However, you may need the ear cleaned by a health care provider from time to time. Another surgery may be needed if the cholesteatoma comes back.
When to Contact a Medical Professional
Call your provider if ear pain, drainage from the ear, or other symptoms occur or worsen, or if hearing loss occurs.
Prompt and thorough treatment of chronic ear infection may help prevent cholesteatoma.
Chronic ear infection - cholesteatoma; Chronic otitis - cholesteatoma
Chole RA. Chronic otitis media, mastoiditis, and petrositis. In: Flint PW, Haughey BH, Lund V, et al, eds. Cummings Otolaryngology: Head & Neck Surgery. 6th ed. Philadelphia, PA: Elsevier Saunders; 2015:chap 139.
O'Handley JG, Tobin EJ, Shah AR. Otorhinolaryngology. In: Rakel RE, Rakel DP, eds. Textbook of Family Medicine. 9th ed. Philadelphia, PA: Elsevier; 2016:chap 18.
Review Date 5/17/2018
Updated by: Josef Shargorodsky, MD, MPH, Johns Hopkins University School of Medicine, Baltimore, MD. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.