2,3) This disease is distinguished from keratosis obturans because cholesteatoma develops after a primary canal bone disorder.
Keratosis obturans and external auditory canal cholesteatoma.
Cholesteatoma of the external auditory canal and keratosis obturans
The pathologic features of keratosis obturans
and cholesteatoma of the external auditory canal.
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
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