Abstract
Tomograms [100] on the [human] petrous bone were studied using Guillen''s transorbital view of the anatomy of the middle ear. It provides basic data concerning the morphology, size and surface area of the tympanum, the epitympanum and the hypotympanum. It correlates the surface area of the epi- and hypotympanum and suggests a certain embryological interpretation. Contributions are made to the diagnostic radiology of the middle ear. The basic data for the interpretation of tomograms in patients with ossicular dislocation and the essential data for the radiology of congenital malformation and of tumors are provided. Certain criteria used for the diagnosis of cholesteatoma are put into prespective. The use of preoperative radiological investigation was justified.

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