Role and Limitations of Computer Tomography in the Diagnosis of Acoustic Neuromas

概要

論文の詳細を見る
Since the development and introduction of CT for the diagnosis of brain tumors, diagnostic accuracy for acoustic neuroma extending more than 2.0cm from the porus of internal auditory canal to the posterior fossa has significantly been raised. However, for tumors confined to the internal auditory canal or those extending one centimeter into the posterior fossa, present CT still has limitations in detecting these tumors. Among eighteen cases (12 acoustic neuromas and 6 cerebellopontine angle tumors) in which the author applied CT, three cases could not be detected. Retrospectively, thirteen percent of ninety-one acoustic tumors went undetected even with application of CT. Therefore, the importance of meatocysternography using Pantopaque for early diagnosis of intracanalicular acoustic tumors is stressed. Among various tests, audiological, vestibular, radiological and neurological examinations, Stenvers view and transorbital view and measurement of stapedius reflex threshold including reflex decay test are all highly diagnostic as screening procedures. Since the recently developed metrizamide CT is still unable to detect intracanalicular acoustic tumors, meatocysternography should be done for suspected cases, even though there are no positive findings on the CT.
日本めまい平衡医学会の論文