CTで真珠腫形成がみられた2症例

抄録

The authors report two cases of surgically confirmed attic cholesteatomas in which the processes of formation were revealed by serial CT scan. The first patient, a 11-year-old boy, was referred to our clinic for acute mastoiditis. A CT scan revealed an infected huge cholesteatoma which had deeply invaded the mastoid resulting in extensive destruction of the ossicles. This patient has been followed up after retinoblastoma surgery done shortly after he was born. A CT scan of the orbit performed at the ophthalmological department two years previously was examined, and it revealed that the middle ear had been nearly normal with intact ossicles and aerated attic and mastoid antrum. The cholesteatoma in this case was thought to have developed from a small attic retraction pocket within the previous two years.
In the second case, an attic cholesteatoma was found to have developed from a retraction pocket of the pars flaccida during a 10 month follow-up period. Comparison of two CT scans, one before and one after this period, showed the development of erosion of the malleus head and soft tissue density in the attic and antrum.