Cholesteatoma

What is cholesteatoma?

A cholesteatoma is an abnormal, noncancerous growth of skin cells that develops in the middle ear, the small air-filled space behind the eardrum. Although the name sounds as if it involves cholesterol or a tumor, it is neither. It is a collection of skin cells and debris that becomes trapped where skin does not normally grow. Over time, this collection can expand slowly, and as it grows it may press on and gradually wear away the delicate structures of the ear, including the tiny hearing bones (called ossicles), the bone that surrounds the ear, and, in advanced cases, structures close to the ear such as the facial nerve or the inner ear.

When people search for “what is cholesteatoma,” the simplest answer is this: it is a skin-lined pocket or cyst in the wrong place. Skin cells normally shed and are cleared away from the ear canal. Inside a cholesteatoma, however, the shed cells have nowhere to go, so they build up layer by layer. The trapped material can also become infected, which is why many people with a cholesteatoma have repeated ear infections or an ear that drains fluid over and over again.

Cholesteatoma can affect people of any age, including children and adults. Some people are born with a small rest of skin cells behind an intact eardrum; this is called a congenital cholesteatoma and is usually discovered in childhood. Much more commonly, cholesteatoma is acquired, meaning it develops later in life, often after long-standing problems with the eustachian tube (the narrow passage that connects the middle ear to the back of the nose and normally equalizes pressure) or after repeated middle ear infections. In the international disease classification, cholesteatoma of the middle ear is coded as ICD-10 H71.90 when the affected ear is unspecified.

Cholesteatoma is not cancer and does not spread through the body the way cancer does. However, it is not harmless. Because it grows steadily in a confined space next to important structures, an untreated cholesteatoma can lead to permanent hearing loss and, less commonly, more serious complications. For this reason, it is generally treated actively rather than simply observed for long periods.

Symptoms of cholesteatoma

Cholesteatoma symptoms often begin quietly and progress slowly, which is one reason the condition can go unnoticed for months or even years. Many people first attribute their symptoms to a stubborn ear infection or to wax buildup. Common cholesteatoma symptoms include:

• Ear drainage: fluid leaking from the ear, often with an unpleasant smell, that keeps coming back or never fully clears despite treatment.
• Hearing loss: usually in one ear, often gradual, caused by the growth blocking sound or damaging the hearing bones.
• A feeling of fullness or pressure: a sensation that the ear is blocked or plugged.
• Ear discomfort or ache: pain is not always present, but a dull ache behind or inside the ear can occur, especially during infections.
• Tinnitus: ringing, buzzing, or other noises heard in the affected ear.
• Dizziness or balance problems: these may appear if the growth begins to affect the inner ear, which controls balance.
• Facial muscle weakness: a rare but important sign that the growth may be pressing on the facial nerve, which runs through the ear.

Symptoms can differ depending on the type and stage of the condition. A congenital cholesteatoma in a young child often causes no drainage at first, because the eardrum is intact; it may be discovered as a white spot behind the eardrum during a routine ear examination, or it may come to attention only when hearing loss is noticed. An acquired cholesteatoma, by contrast, more typically announces itself with recurring, foul-smelling discharge and slowly worsening hearing in one ear.

In early stages, symptoms tend to be mild: intermittent drainage, mild fullness, or a subtle change in hearing. As the growth enlarges, hearing loss usually becomes more noticeable, and drainage becomes more persistent. In advanced stages, symptoms such as significant dizziness, spinning sensations (vertigo), facial weakness, severe pain, or headache can signal that the growth has reached the inner ear, the facial nerve, or the bone separating the ear from the brain. These late-stage symptoms are uncommon but should always be evaluated promptly.

It is worth emphasizing that a cholesteatoma can be present even when pain is minimal or absent. Painless but persistent ear drainage with hearing loss in one ear is a pattern that deserves medical evaluation, even if it does not feel urgent.

Causes and risk factors

Cholesteatoma causes fall into two broad groups: congenital (present from birth) and acquired (developing later). Acquired cholesteatoma is far more common, and its development is usually linked to problems with pressure regulation and ventilation of the middle ear.

The middle ear needs a steady supply of air, which arrives through the eustachian tube. When this tube does not work well, for example because of frequent colds, allergies, sinus problems, or enlarged adenoids in children, negative pressure can build up in the middle ear. Over time, this negative pressure can pull part of the eardrum inward, creating a pocket. Skin cells that shed inside this pocket cannot escape, and the trapped debris gradually forms a cholesteatoma. This is often called a retraction-pocket cholesteatoma.

Other recognized causes and risk factors include:

• Repeated or chronic middle ear infections: long-standing inflammation can damage the eardrum and encourage abnormal skin growth.
• A hole (perforation) in the eardrum: whether from infection, injury, or pressure changes, a perforation can allow skin from the ear canal to migrate into the middle ear where it does not belong.
• Previous ear surgery or ear trauma: in some cases, skin cells can be introduced into the middle ear during injury or a procedure.
• Eustachian tube dysfunction: from allergies, chronic sinus disease, cleft palate, or other conditions that affect how the tube opens and closes.
• Childhood ear disease: children who have had many ear infections or long-term fluid behind the eardrum may be at higher risk later on.

Congenital cholesteatoma has a different origin: a small remnant of skin-forming cells is left behind the eardrum during development before birth. These children typically have no history of ear infections or eardrum perforation, which is one clue that distinguishes congenital from acquired disease.

Cholesteatoma is not caused by poor hygiene, and it is not contagious. Having risk factors does not mean a person will definitely develop the condition; it simply means the likelihood is higher than average.

Diagnosis

Cholesteatoma diagnosis usually begins with a careful history and a physical examination of the ear. A doctor, often an ear, nose, and throat (ENT) specialist, also called an otolaryngologist, will ask about ear drainage, hearing changes, past infections, and any dizziness or facial symptoms.

The core steps in confirming a cholesteatoma typically include:

• Otoscopy and otomicroscopy: examination of the ear canal and eardrum with an otoscope (a lighted hand-held instrument) or a microscope. The doctor looks for a retraction pocket, a perforation, skin debris, crusting, or a pearly white mass behind or involving the eardrum. Debris and discharge may be gently cleaned away under the microscope to allow a clear view.
• Hearing tests (audiometry): a formal hearing test measures how well each ear hears and helps determine whether hearing loss is conductive (caused by a mechanical problem, such as damaged hearing bones) or sensorineural (caused by inner ear or nerve involvement). Cholesteatoma most often causes conductive hearing loss, but mixed patterns can occur.
• Tympanometry: a quick test that measures how the eardrum moves in response to pressure, which can reveal a perforation or poor middle ear ventilation.
• Computed tomography (CT) scan: a detailed X-ray-based image of the temporal bone (the skull bone that houses the ear). CT is commonly used to map how far the cholesteatoma extends, to check for erosion of the hearing bones or surrounding bone, and to help the surgeon plan an operation. CT cannot always distinguish cholesteatoma from other soft tissue, but it shows the bony anatomy well.
• Magnetic resonance imaging (MRI): in selected cases, particular MRI techniques can help distinguish cholesteatoma from scar tissue or fluid. MRI is especially useful when doctors are checking for residual or recurrent disease after previous surgery.

There is no blood test for cholesteatoma. The diagnosis is usually made from the combination of a suggestive history, the appearance of the ear under magnification, hearing test results, and imaging. Definitive confirmation comes when the tissue is removed during surgery and examined, but in most cases the clinical picture is clear enough for doctors to recommend treatment beforehand. Within hospital systems such as Acibadem, this evaluation is generally carried out by the otolaryngology (ENT) department, often together with audiology specialists who perform the hearing tests.

Treatment options for cholesteatoma

The central fact about cholesteatoma treatment is that the growth does not go away on its own and cannot be cured with medication alone. Because it tends to enlarge over time and can damage nearby structures, surgery to remove it is the standard and definitive treatment in the great majority of cases. That said, care usually proceeds in stages.

Medical management before surgery

When the ear is actively infected or draining, doctors often begin with measures to quiet the infection and clean the ear. This may include careful cleaning of debris under a microscope (called aural toilet), antibiotic or antiseptic ear drops, and sometimes oral antibiotics if the infection is more extensive. These treatments can reduce drainage and discomfort, but they do not remove the cholesteatoma itself. They are a preparation for surgery, not a substitute for it.

Watchful waiting in limited situations

True watchful waiting is uncommon for confirmed cholesteatoma, because delay allows the growth to enlarge. However, in certain situations, for example, a very small, stable retraction pocket without trapped debris, or a patient whose overall health makes surgery unusually risky, a doctor may recommend close monitoring with regular examinations and repeated imaging instead of immediate surgery. This decision is individualized and made together with the patient after discussing the risks of both approaches.

Surgery

The goal of surgery is first and foremost to remove all cholesteatoma tissue and create a safe, dry ear; improving hearing is an important but secondary goal. Common surgical approaches include:

• Tympanoplasty: repair of the eardrum, often combined with removal of disease from the middle ear.
• Mastoidectomy: removal of diseased tissue from the mastoid bone, the honeycomb-like bone behind the ear. Depending on how far the cholesteatoma extends, the surgeon may preserve the ear canal wall (“canal wall up”) or remove part of it (“canal wall down”) to make sure all disease is reached. Each approach has trade-offs that the surgeon will explain.
• Ossiculoplasty: reconstruction of damaged hearing bones using tiny prostheses or reshaped bone or cartilage, performed either during the initial operation or at a later stage.

Surgery is usually performed under general anesthesia, and many patients go home the same day or after a short hospital stay. Because cholesteatoma can leave behind microscopic remnants, surgeons often plan a follow-up strategy in advance. This may involve a planned second operation months later to check for residual disease and reconstruct hearing, or long-term surveillance with examinations and specialized MRI scans. Recurrence is a recognized possibility, which is why continued follow-up matters even after a successful operation.

Hearing rehabilitation

If hearing loss remains after treatment, options may include hearing aids or, in selected cases, implantable hearing devices. The best choice depends on the type and degree of hearing loss and on the condition of the ear after surgery.

Living with cholesteatoma and outlook

For most people, the outlook after appropriate cholesteatoma treatment is good: surgery usually removes the disease, stops the recurring drainage and infections, and prevents further damage. At the same time, it is honest to say that outcomes vary. Hearing after surgery depends heavily on how much damage the cholesteatoma caused before it was removed. Some patients regain useful hearing, others have stable but reduced hearing, and a smaller number need hearing devices.

Long-term follow-up is a normal part of living with this condition. Because residual or recurrent cholesteatoma can develop, sometimes years later, doctors typically recommend periodic ear examinations and, in some cases, follow-up imaging for an extended period. Attending these visits, even when the ear feels fine, is one of the most important things a patient can do.

Practical points that many patients find helpful include keeping the operated ear dry as advised by the surgeon (especially in the early healing period), treating colds, allergies, and sinus problems promptly to support eustachian tube function, and reporting any return of drainage, new hearing changes, or dizziness rather than waiting for the next scheduled visit. Air travel and swimming are often possible after healing, but timing differs from person to person, so guidance from the treating team should be followed.

Untreated cholesteatoma carries real risks, including progressive hearing loss, chronic infection, balance problems, facial nerve injury, and, rarely, serious infections that spread beyond the ear. These complications are uncommon with timely care, which is why early evaluation and treatment are emphasized.

Frequently asked questions

What is cholesteatoma in simple terms?

A cholesteatoma is a benign (noncancerous) growth of trapped skin cells in the middle ear, the space behind the eardrum. Because shed skin cells cannot escape, they build up over time and form a slowly enlarging pocket that can damage the hearing bones and surrounding structures. Despite the name, it has nothing to do with cholesterol and is not a tumor in the cancerous sense.

Can a cholesteatoma heal or go away on its own?

No. A cholesteatoma does not resolve by itself, and medications such as ear drops or antibiotics can only control infection around it; they cannot remove the growth. Because it typically continues to enlarge, surgery is generally the recommended treatment. Your doctor can explain the timing and approach that fit your situation.

How serious is a cholesteatoma?

It is a condition that should be taken seriously, but with timely treatment most people do well. Left untreated, a cholesteatoma can gradually erode the hearing bones and nearby structures, leading to permanent hearing loss and, in rare cases, complications involving the facial nerve, the balance organ, or the tissues near the brain. Early diagnosis and treatment substantially reduce these risks.

What are the first symptoms of cholesteatoma?

Early cholesteatoma symptoms are often subtle: a feeling of fullness in one ear, mild hearing loss, or ear drainage that keeps returning, sometimes with an unpleasant smell. Pain may be mild or absent. Because these symptoms overlap with ordinary ear infections, a persistent or recurring pattern in one ear is the key warning sign that deserves an ENT evaluation.

How is cholesteatoma diagnosed?

Doctors usually confirm the diagnosis by examining the ear under magnification, performing hearing tests, and ordering imaging. A CT scan of the temporal bone shows how far the growth extends and whether bone has been eroded, and MRI is sometimes used to distinguish cholesteatoma from other tissue, especially after previous surgery. There is no blood test for this condition.

What is recovery like after cholesteatoma surgery?

Recovery varies with the extent of the operation, but many people return to everyday activities within a few weeks. The ear typically needs to be kept dry while it heals, and follow-up visits are needed to clean the ear and check healing. Hearing results depend on how much damage existed before surgery, and some patients need a planned second procedure to check for residual disease or to reconstruct hearing.

Can cholesteatoma come back after treatment?

Yes, recurrence is possible, either because microscopic remnants were left behind or because a new retraction pocket forms. This is why surgeons plan long-term follow-up, which may include regular examinations, MRI surveillance, or a planned second-look operation. Attending follow-up appointments is important even when the ear feels completely normal.

When to see a doctor

Anyone with ear drainage that keeps returning, hearing loss in one ear, or a persistent feeling of blockage should have the ear examined, even if there is little or no pain. Conditions like cholesteatoma are far easier to treat when found early. In hospital groups such as Acibadem, these evaluations are handled by ENT (otolaryngology) departments.

Seek medical attention urgently if you experience any of the following red-flag signs, which can indicate a complication that needs prompt treatment:

• Sudden facial weakness or drooping on the same side as the affected ear.
• Severe dizziness or spinning sensations (vertigo), especially with nausea or vomiting.
• Sudden or rapidly worsening hearing loss.
• High fever with severe ear pain, or pain, redness, and swelling behind the ear.
• Severe headache, a stiff neck, confusion, or drowsiness together with ear symptoms.
• Blood-stained or foul-smelling discharge that does not improve with prescribed treatment.

These symptoms do not always mean a serious complication has occurred, but they should always be evaluated without delay. This article is for general information only and does not replace an examination and personal advice from a qualified physician.