Diseases Of The Nose Throat And Ear

152 THE LARYNX, BRONCHI AND OESOPHAGUS

exophytic supraglottic tumour which obscures the vocal cords on mirror
examination. It is also of importance in identifying the site and extent of a
tracheal stenosis. The use of the polytome has made this a procedure of high
value.

Fig. 71. Tomograph to show glottic carcinoma of larynx.

Fig. 72. Laryngogram.

3. Laryngography (Fig. 72). Laryngography is a relatively new procedure
which has added a new and valuable dimension to the investigation of
laryngeal disease. It is done by drying the larynx by giving the patient an
injection of atropine, anaesthetizing it by a superior laryngeal nerve block, and
running a little radio-opaque dye into the larynx by means of a catheter
passed through one nostril into the pharynx. Once the dye is in the larynx the