The decisive influence of the os sphenoidale in its different parts on the malformations and diseases of the oto- and rhinobasis. Congenital epidermoid (so called cholesteatoma) and entodermal cyst of the os petrosum. Malformations of the middle ear. Hyper- and hypoteleroismus, their surgery. The osteodystrophies. Are slow changes during lifetime of the petrous bone the cause of otospongiosis (A. Sercer, J. Krmpotic)? Surgical prevention of the effect of this tension of the cortex of the petrous pyramid on the capsule of cochlea? Anomalies and aneurysma of the carotid arterie inside of the temporal bone. The diseases of the surface of the temporal and sphenoidal bone in the basicranium and infratemporal. The effect on the Eustachian tube.
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