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Patient with cholesteatoma on the right and chronic otitis media without cholesteatoma on the left. A, Axial HRCT scan shows the mass lesion (black arrow) in the tympanic cavity with ossicle erosion (white arrow) and erosion of the anterior wall of the epitympanum (dashed arrow). B, Axial HRCT scan demonstrates a mass lesion (black arrow) in the epitympanum, but no bony erosion (white arrow).
