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The structure of the opening of the Eustachian tube of 702 cases were observed with fiberoptic endoscope, and the relationship between the difficulty in ear douche by Eustachian tube catheterization and the shape of the orifice was discussed. The shape of pharyngeal orifice of the tube was classified into two types. The one which is well-known as ordinary shaped was named as type I, while the other which has an arched upper edge by torus tubarius was termed as type II. Type II orifices were found more frequently (54.3%) than type I. Insertion of a catheter was difficult in type II ones because the tip of catheters was apt to slip down from the tubal elevation. Moreover, anatomical irregularities in the nasopharynx, which is observed quite often, seem to be a factor of difficulties in douching the tube. In case of a failure in ear douches, it is necessary for us to detect its cause, and in case of type II orifice, the way of probing the orifice should be changed. I have treated some patients who were suffered from tubal obstruction with an injection of remedies into the auditory tubes, observing with remodelled Olympus NPF-S3 fiberscope, and have got a good result.

TREATMENT OF EUSTACHIAN TUBE USING A REMODELLED FIBERSCOPE CONFORMED TO THE ANATOMICAL VARIETY OF ITS ORIFICE