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Zenker's hypopharynx diverticles are relatively rare in Japan when compared to cases reported in Europe and America. A typical case of this disease with the diverticle larger than the size of a walnut was seen in a 56 years old house wife. Operation was done by one stage sac extirpation through left external neck incision and an uneventfull cure was attained after several endoscopic dilatations were performed.Etiology on evolutionary and pathological factors, sex and age distribution, symptoms, findings, diagnosis and differential diagnosis, histology of sac, and finally various methods of treatment were discussed.Surgical treatments at present are as follows; 1) Sectioning of the diverticle lip by endoscopy (German method).2) Sectioning of the sphincter muscle of the so called "Schleudermuskel" (=Pars fundiformis of M. constrictor pharyngeus inf.) by way of lateral neck incision (German method).3) One stage extirpation of sac body by way of lateral neck incision (English and American method).

It is designed handy, and has many advantages for practical use. The main characteristics are as follows :1) It can be manipulated by the examiner for himself.2) Examination of the larynx will be completed in the whole interval by the two discs each of which has 8 and 20 holes respectively.3) Rotation of the disc is regulated by a differential gear under control of a screw; adjustment of they rotation can be achieved easily and promptly. 4) Good optics and great intensity of light is ensured.

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