Cholesteatomas of the temporal bone: role of computed tomography.

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Abstract
Computed tomography (CT) of the temporal bone was performed in 64 patients thought to have a cholesteatoma of the middle ear; 20 had not had surgery before, while 44 had been operated on. Special consideration was given to 21 patients who were scanned immediately before a 2nd operation and had confirmation of the CT findings. Inflammatory disease without cholesteatoma was characterized by absence of erosion of the otic capsule or ossicular chain. Sharply circumscribed cholesteatomas were easily diagnosed by CT. When they were combined with scarring, granulation tissue, or postsurgical changes, the resulting soft-tissue masses were indistinguishable, although cholesteatoma may be suspected if there is evidence of progressive bone erosion about the middle ear. CT can play a major role in postoperative follow-up by confirming that the ear is normal and demonstrating displacement of ossicular grafts or prostheses.

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