[An unusual and dangerous clinical form: chronic osteomatous otitis].

Some chronic otites result in local or diffuse attico-antral osseous outgrowths. These may complicate all sorts of chronic otites: cholesteatomatous or otherwise, suppurative or merely inflammatory, with the tympanum open or closed. They should be distinguisged from tympanosclerosis and condensation or osseous eburnation lesions. They seem to result from post-inflammatory irritation causing metaplastic bone growth or from an exostosis. The key to their diagnosis lies in radio-tomography. From the surgical point of view, diffuse attico-antral forms are particularly dangerous and deadly. It is essential that the kopho-surgeon should be aware of their existence which, as far as we know, does not seem to have been noted so far.