The role of high-resolution CT in evaluating disease of the posterior tympanum.
スポンサーリンク
概要
- 論文の詳細を見る
The posterior tympanum consists of several irregular eminences, ridges, and sinuses. These sinuses do not communicate with the mastoid air cell system, and cholesteatoma and/or granulation tissue prefer to fill them. This area cannot be visualized with ease by the usual surgical approach, and is thus quite important for surgeons. Recent developments in high-resolution computed tomography (HRCT) allow more than ever precise identification of subtle changes in the posterior tympanum. Axial HRCT sections provide essential information for the preoperative evaluation of the posterior tympanum. The perfor- mance of surgeons has been promoted both in evaluation and treatment planning of patient with suspected posterior tympanic lesions. HRCT findings were compared with the operative findings in 52 patients (54 ears) who had the operation for chronic otitis media. Important findings by HRCT diagnosis of posterior tympanum are as follows ; (1) Bone destruction in the posterosuperior part of the tympanic anulus and in the lateral wall of the facial sinus are the important findings for the diagnosis of invasion of cholesteatoma in the posterior tympanum. (2) Similarly important finding is the bone destruction of the pyramidal eminence. This wasfound in 6 0f9 cases with cholesteatomas extending into the sinustympani.(3)Thesofttissu edensityintheposteriortympanumdoesnotnecessarilyindicatepathologi-cal processes.Effusion in the posterior tympanum isimaged assofttissue density, and can notbe differentiatedfromcholesteatoma or granulation by presentHRCT.
- 一般社団法人 日本耳鼻咽喉科学会の論文