Diagnostic significance of endoscopy of the eustachian tube.

The significance of introducing endoscopic examination to evaluate Eustachian tube dysfunction including the newly developed pneumatic endoscopic procedure is discussed. The pneumatic endoscopic procedure at the three selected portions; the pharyngeal adjacent tubal area, the pharyngeal tubal orifice, and the lumen of the cartilaginous portion, is useful to detect topographic pathology, and its diagnostic significance may be attributed to visual detection of the morphological pathology.