(KO) refers to the abnormal accumulation of keratin debris, forming wax plugs in the EAC, leading to its symptomatic presentation.
An EAC nevus may cause conductive hearing loss because of its enlarging mass, causing obstruction of the EAC or possibly a keratosis obturans
EACC is often mistaken with keratosis obturans
. Rarely such cases with circumferential EAC involvement have been reported with an additional exposure of the facial nerve.
However, soft-tissue abnormalities in EAC can include atresia, edema, hemorrhage, keratosis obturans
, cholesteatoma, adenoma, ceruminoma, fibroma, mixed tumors, as well as squamous cell, basal cell, and adenocystic carcinoma .
(KO) is the accumulation of desquamated keratin appearing as large plug in the external auditory canal.
OF CASES TYMPANOPLASTY 444 TYMPANOPLASTY WITH MASTOIDECTOMY 116 EXTERNAL AUDITORY CANAL POLYPECTOMY 23 STAPEDOTOMY 18 TEAR EAR LOBULE REPAIR 15 KERATOSIS OBTURANS
REMOVAL 11 WINDOW OPERATION 10 I & D OF POST AURICULAR ABSCESS 10 PREAURICULAR SINUS EXCISION 5 POSTAURICULAR DERMOID EXCISION 5 Table 2: DISTRIBUTION OF NOSE SURGERIES TYPE OF SURGERY No.
(2,3) This disease is distinguished from keratosis obturans
because cholesteatoma develops after a primary canal bone disorder.
A 17-year-old boy was seen on routine follow-up a few months after he had undergone a right meatoplasty to treat keratosis obturans
. He was well and asymptomatic, but examination revealed the presence of two keratin pearls in the posterosuperior ear canal (figure).
(1) Until 1980, external auditory canal cholesteatoma and keratosis obturans
were considered to be different presentations of the same disease.
(1) The differential diagnosis of an external auditory canal cholesteatoma (EACC) includes keratosis obturans
, postinflammatory medial canal fibrosis, malignant otitis externa, and squamous cell carcinoma.
Table 1 Benign and malignant conditions of the external auditory canal Benign Malignant Cholesteatoma Basal cell carcinoma Eosinophilic granuloma Ceruminous gland tumor Exostosis Melanoma Fibrous dysplasia Metastatic disease Keratosis obturans
Soft-tissue sarcoma (children) Neurofibroma Squamous cell carcinoma Osteoma Paraganglioma Stenosis Temporomandibular joint hemiation
. Some patients have a plug in the ear canal that is pearly white and is completely made up of densely compressed keratin squames.