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The important rôle played by the eustachian tube in its relation to the normal and pathologic middle and internal ear has been a subject of intense interest and study to the otolaryngologist.
Fig. 1.— Moderately advanced sclerotic changes in the mastoid, involving also the bony portion of the eustachian tube, as shown in a young boy suffering with chronic suppuration of the middle ear and deafness; the tube has not been filled with iodized oil; M indicates the mastoid; T, tympanic cavity; B, bony portion of eustachian tube; G, glenoid fossa; C, condyle of the mandible.
Although the anatomy, physiology and pathology of the eustachian tube are apparently well known, there are many problems concerning the pathology which remain unsolved. For instance, little is known concerning the variety, character and location of the stenoses or strictures of the eustachian tube and the relation they bear to diseases of the