|Year : 2018 | Volume
| Issue : 4 | Page : 268-269
Silent keratosis obturans causing exposure of the facial nerve
Senthilraj Retinasekharan, Mohd Khairi Md Daud
Department of Otorhinolaryngology Head and Neck Surgery, School of Medical Sciences, Health Campus, Universiti Sains Malaysia, Kubang Kerian, Kelantan, Malaysia
|Date of Web Publication||15-Mar-2019|
Prof. Mohd Khairi Md Daud
Department of Otorhinolaryngology Head and Neck Surgery, School of Medical Sciences, Health Campus, Universiti Sains Malaysia, 16150 Kubang Kerian, Kelantan
Source of Support: None, Conflict of Interest: None
Keratosis obturans is a condition of the external ear canal and could be described as an intensification of keratin plugs within the canal. The disease may lead to erosion and widening of the external auditory canal. Undiagnosed wax keratosis may lie passively for a long period without revealing any symptoms. We report a case that was largely silent causing exposure of the vertical segment of the facial nerve.
Keywords: External auditory canal, facial nerve, keratosis obturans
|How to cite this article:|
Retinasekharan S, Daud MK. Silent keratosis obturans causing exposure of the facial nerve. Indian J Otol 2018;24:268-9
| Introduction|| |
Keratosis obturans is an accumulation of obstructing desquamated keratin plugs in the external ear canal. Although the origin of this condition remains uncertain, it is thought to be due to chronic hyperemia of the external meatus. Another external ear condition frequently described is external ear canal cholesteatoma (EACC). The squamous tissue at a specific site causing bone erosion in the external auditory canal. The indicative clinical manifestations of keratosis obturans are severe otalgia and conductive deafness secondary to the intensification of desquamated material in the external ear. We present a case of keratosis obturans that the disease presentation was largely silent but has caused severe destruction of the EAC exposing the vertical segment of the facial nerve.
| Case Report|| |
A 20-year-old female presented to our clinic with the complaints of pain, reduced hearing, and blocking sensation over her right ear for 3 weeks duration. A detailed history taken revealed that she had similar complaints about 4 years back, for which she was administered ear drop and no further treatment since then until her recent visit to the ORL clinic about 2 weeks before the last visit. She had impacted keratinous debris over her right ear canal which was toileted, and the tissues sent for histopathology examination.
Clinical examination on the last visit revealed a normal looking ear with an apparent automastoidectomy cavity on the right containing whitish keratinous debris [Figure 1]. The tympanic membrane was observed intact while the facial nerve was partially visible in the posterior ear canal wall after aural toileting [Figure 2]. Nevertheless, there was no facial nerve palsy, and the left ear was normal.
|Figure 1: Right external ear canal covered with whitish keratinous debris|
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|Figure 2: Posttoiletting, revealing intact tympanic membrane, eroded posterior canal wall with partially visible facial nerve (Arrow pointing to vertical segment of the facial nerve)|
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A pure -tone audiogram showed normal hearing in the left ear and mild high-frequency sensorineural hearing loss at 6 kHz and 8 kHz in the right ear ranging from 30 to 40 dB. The specimen sent for histopathological examination microscopically showed fragments of tightly packed keratin squames in lamellar pattern. This was consistent with keratosis obturans.
| Discussion|| |
Most literatures compare keratosis obturans and EACC as both occur in the external ear canal and they have some similar characteristics. However, there are differences in clinical basis. Undiagnosed wax keratosis may lie passively for a long period without revealing any symptoms apart from slight deafness, even it might be not apparent. During this period, the surrounding envelope merely becomes thickened by further desquamation of the epithelium. This process may progress to a stage where the wax keratosis becomes firm that it erodes by pressure alone, first, the epithelium of the deep external auditory canal, and then the bony canal, giving rise to a true keratosis obturans. A period of many years may elapse before it is detected, commonly in an adult patient. Piepergerdes et al. reported that the bilateral occurrence of keratosis obturans more frequently in children.
Generally, the most common presenting symptom is otalgia which is mostly acute and severe. The pain ranges from a constant throbbing ache to such excruciating pain that the sufferer sometimes could not even sleep the entire night. There is also accompanying conductive hearing loss due to mechanical obstruction of the external ear.
There has been report of a case of automastoidectomy caused by neglected keratosis obturans. In that case, the bone resorption occurred just posterior to the bony annulus and extended back into the mastoid, but no soft-tissue structures were reported to be exposed. The vertical segment of the facial nerve has been exposed in our patient.
It has been suggested that there are two types of keratosis obturans: inflammatory and silent. The silent type has rarely been reported; although, this case report may be categorized into the silent type of keratosis obturans. The inflammatory type occurs secondary to an acute problem, such as viral infection, causing inflammation of the ear canal which temporarily alters the epithelial migration. This is cured by removal. Whereas, the silent type carries on and on and is suggested to be caused by the abnormal separation of the keratin that persists even after the first removal, needing subsequent removals. There are reports of complications such as labyrinthine fistula, tegmen dehiscence, facial nerve palsy, and dehiscence of the temporomandibular joint and jugular bulb.
| Conclusion|| |
Keratosis obturans may be benign but it is silently can result in extensive bony erosions. Hence, high clinical suspicion and prompt management are important as the treatment delay may result in serious complications.
Declaration of patient consent
The authors certify that they have obtained all appropriate patient consent forms. In the form the patient(s) has/have given his/her/their consent for his/her/their images and other clinical information to be reported in the journal. The patients understand that their names and initials will not be published and due efforts will be made to conceal their identity, but anonymity cannot be guaranteed.
Financial support and sponsorship
Conflicts of interest
There are no conflicts of interest.
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[Figure 1], [Figure 2]