External auditory canal cholesteatoma

External auditory canal exostosis (EACE) is prone to occur in patients frequently exposed to cold water, which causes earwax impaction, recurrent otitis externa, and conductive hearing loss. The main treatment for symptomatic EACE is surgical excision. External auditory canal cholesteatoma (EACC) is a bone-destructive cystic mass caused by accumulation of plugs of desquamated keratin debris in the external auditory canal (EAC), which is also mainly treated with surgical removal. The main difficulties in the surgical removal of obstructive EACEs or EACCs are related to the adjacency of EAC skin, tympanic membrane, temporomandibular joint, and the blockage of the medial EAC landmarks during the operation. The piezoelectric device (PZD), which has long been used to cut bony structures in dental surgery, has clinical advantages here with regards to accurate exclusive bone cutting ability and minimal heat production. We report a series of cases that managed EAC lesions using PZD.

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A Case of Squamous-cell Carcinoma Originating in External Auditory Canal Cholesteatoma

Journal of Nippon Medical School ◽

10.1272/jnms.70.363 ◽

2003 ◽

Vol 70 (4) ◽

pp. 363-366 ◽

Cited By ~ 1

Author(s):

Hideharu Aoki ◽

Kouji Matsumoto

Keyword(s):

Squamous Cell Carcinoma ◽

Cell Carcinoma ◽

Squamous Cell ◽

External Auditory Canal ◽

External Auditory Canal Cholesteatoma

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Complications of keratosis obturans

The Journal of Laryngology & Otology ◽

10.1017/s0022215106002349 ◽

2006 ◽

Vol 120 (9) ◽

pp. 740-744 ◽

Cited By ~ 15

Author(s):

N C Saunders ◽

R Malhotra ◽

N Biggs ◽

P A Fagan

Keyword(s):

Hearing Loss ◽

Facial Nerve ◽

External Auditory Canal ◽

Bone Erosion ◽

Disease Process ◽

Jugular Bulb ◽

Horizontal Semicircular Canal ◽

The Third ◽

Tegmen Tympani ◽

External Auditory Canal Cholesteatoma

Three patients with extensive keratosis obturans were treated during a 12-month period. One presented with an idiopathic sensorineural hearing loss and was found to have keratosis obturans in the contralateral, asymptomatic ear. The disease process had resulted in a horizontal semicircular canal fistula in what was now, effectively, the only hearing ear. The second patient had an extensive dehiscence of the tegmen tympani. The third presented with a facial palsy. An automastoidectomy cavity was present, with circumferential skeletonization of the descending facial nerve over a length of 1.5 cm and dehiscence of the temporomandibular joint and jugular bulb. All three patients were successfully treated by surgical formalization of their automastoidectomy cavities. They appeared to represent cases of keratosis obturans rather than external auditory canal cholesteatoma, on the basis of previously published reports.These complications and patterns of bone erosion have not previously been described in keratosis obturans. The third patient is believed to have the most extensive case of keratosis obturans yet described.

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