Table of Contents
Introduction
A rare keratosis obturans (KO) causes the ear canal to enlarge and become blocked due to keratin accumulation. Hearing loss and excruciating ear discomfort may result from this. KO has unique characteristics. However, it is frequently confused with impacted earwax. It causes rapid hearing loss, excruciating pain, a wider ear canal, and a thicker eardrum; it primarily affects younger people. In contrast to KO, external auditory canal cholesteatoma is caused by squamous tissue invading an inflammatory portion of the ear canal, resulting in chronic dull pain and continuous ear discharge.
What Distinguishes Keratosis Obturans From Regular Ear Wax Buildup Complications?
In a rare keratosis obturates disorder, the inner half of the ear canal develops a keratinized plug. The protein keratin, which is present in skin and nails, gives them stiffness and strength. Because the skin sheds frequently, highly keratinized skin, such as calluses on guitar players' fingers, has a high turnover rate.
Normally, the skin that lines the ear canal migrates along the walls of the ear canal and outward from the eardrum. When this skin enters the outer ear canal, it combines with sweat and oils to create ear wax, a mixture of oils, perspiration, and dead skin cells. Ear wax darkens with age because of oxidation and dehydration.
Keratosis obturates disrupts the normal migration of skin cells. Dead skin cells build up in the inner ear canal, forming a semi-hard plug rather than migrating outward. An accelerated skin formation or shedding rate may contribute to this disorder since skin cells layer over one another, much like onion skin. The keratinized plug forms in the inner ear canal and is lighter in color and tougher than ear wax, which forms in the outer ear canal and contains oils and sweating.
If left untreated, the keratin plug may swell to a dense mass, applying pressure that could destroy the bone of the ear canal. Tinnitus, ear ringing, pain, and hearing loss are typical symptoms. Keratosis obturans is not an infection, although it can cause infections, particularly in those with compromised immune systems, including those with HIV or diabetes. A severe systemic infection (septic reaction) may result from infections extending to nearby regions, including the jaw, teeth, and skull base.
What Are the Pathological Characteristics of Keratosis Obturans?
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Deep down the ear canal, KO is distinguished by a thick plug of keratin debris.
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The tissue lining the ear canal, known as the underlying epithelium, has undergone hyperplasia or increased growth.
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Beneath the epithelium is the tissue where chronic inflammation takes place.
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The ear canal grows and changes in shape.
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The underlying bone shows no erosion or necrosis (tissue death).
What Are the Risk Factors and Symptoms of Keratosis Obturans?
Predisposing Factors and History:
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It usually affects people who are 40 years of age or younger.
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Frequently linked to a history of sinusitis (the tissue that lines the sinuses swells or becomes inflamed) or bronchiectasis (a chronic illness where the lungs' airways enlarge and produce an accumulation of extra mucus that can increase the risk of infection).
Symptoms:
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An ear fullness sensation.
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Conductive hearing loss results from issues with the middle ear, eardrum, or ear canal.
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Extreme ear pain.
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Rarely discharge from the ears.
How Is Keratosis Obturans Diagnosed?
Physical Examination Findings:
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Ear canal accumulation of keratin debris.
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The ear canal widening and remodeling.
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Eardrum thickening.
Examination and Research:
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KO may be misdiagnosed as impacted earwax, which could result in the wrong course of treatment.
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Different treatment procedures are used for KO and external auditory canal cholesteatoma. Thus, it is vital to distinguish between the two.
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KO frequently affects both ears.
Definitions of Levels of Care (In This Guideline):
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Level 1: Community healthcare worker or non-doctor.
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Level 2: Medical doctor.
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Level 3: ENT surgeon.
Steps in the Examination:
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Level 1: While the examiner pulls the ear upward and backward, the patient should pull the tragus forward. The ear canal can be examined with a light source (such as a torch, pen light, phone light, lantern, or sunshine).
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Level 2: An otoscope should be utilized for a more thorough inspection.
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Level 3: Oto-endoscopy or oto-microscopy can be used to obtain even more information. A biopsy may be taken to examine the material pathologically. A temporal bone CT scan may be considered to distinguish KO from other disorders, such as external auditory canal cholesteatoma or tumor invasion of the temporal bone.
CT Findings for Keratosis Obturans (KO): A well-defined soft tissue mass within the external auditory canal's (EAC) bony portion may be visible on a CT scan. This mass can potentially cause a diffuse canal expansion without eroding any bone. This is not the case with EAC cholesteatoma, where bone degradation is usually seen. The eardrum, or tympanic membrane, is often unaffected but may seem somewhat thicker.
How Is Keratosis Obturans Managed?
General Management:
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Removing the keratin accumulation in the ear canal is the primary treatment for KO. Since KO is a chronic disorder, hearing and a precise ear canal depend on constant monitoring and keratin removal.
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Usually, the illness results in a gradual enlargement of the ear canal with little to no penetration into the surrounding structures. With long-term follow-up, conservative treatment—which includes careful cleaning is frequently successful.
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It is possible to gently soften the keratin before removal using ear drops comprising hydrogen peroxide, bicarbonate, corticosteroids, and olive oil.
Steps in Management:
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Level 1:
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If the ear canal is obstructed by keratin, clear away as much debris as possible without harming it.
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Send the patient to a specialized center (level 3) if the removal is incomplete.
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Regularly inspect the patient's ear canal for any recurrence following removal.
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Level 2:
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Try to get rid of the KO.
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To lessen irritation after therapy, topical corticosteroid ear drops should be applied.
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Level 3:
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Carefully use suction equipment to remove KO during oto-endoscopy or oto-microscopy.
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A general anesthetic may be used during this operation.
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Consider topical treatment for patients with recurrent KO by inserting a 0.1 percent cream gauze containing Miconazole and Triamcinolone into the ear canal.
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Conclusion
In the rare disorder known as keratosis obturans, keratin builds up in the inner ear canal and forms a hard plug that can cause pain, hearing loss, and tinnitus. This ear plug is lighter in color and more rigid than regular ear wax. Infections and bone erosion are among the problems that can arise from the illness, particularly for those with compromised immune systems. Prompt intervention is essential to avoid severe consequences.
