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  • Title: [Normal meatogram (author's transl)].
    Author: Kobayashi N, Saito Y.
    Journal: No Shinkei Geka; 1976 Nov; 4(11):1057-64. PubMed ID: 1034227.
    Abstract:
    Meatograms obtained in 33 patients (41 examinations) in whom cerebello-pontine angle tumor was excluded clinically and operatively, were studied. Meatographies were performed with a small quantity of contrast medium, and restricted to the visualization of the structures in the auditory canal. Tomographies of antero-posterior view were utilized in all the cases. Normal tomomeatograms were classified into 4 types. In the first type the internal auditory canal not opacified, in the second the contrast medium recognized as a single stream along the superior wall of the internal auditory canal, in the third another parallel line of contrast medium is recognized close to the middle of the internal auditory canal, and in the fourth the contrast medium fills the internal auditory canal with two transparent lines corresponding to the arrangement of the nerves. The nerve roots were recognized as peripheral recess in lateral tomograms of the internal auditory canal. These types of normal meatograms are related to the width of the internal auditory canal. The height of the internal auditory canal of type I is about 3 mm., that of type II is 3 to 5 mm., that of type III is 5 to 7 mm., and that of type IV is over 7 mm.
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