Peroral endoscopy and laryngeal surgery . foreign Iodv. when the foreignbody will show through the transparent tracheo-bronchial tree of theovcrlving positive film. In the film, bony landmarks are not re- 230 FOREIGN BODIES IN AIR AND FOOD PASSAGES. liable because of the wide variation due to the phylogenetic recency ofthe upright posture. Xisceral landmarks are necessary. The two im-portant visceral landmarks are the dome of the pleura and the dome ofthe diaphragm. It is needless to say the tracheo-bronchial tree necessarilylies in the body of the lung between these two landmarks, an
Peroral endoscopy and laryngeal surgery . foreign Iodv. when the foreignbody will show through the transparent tracheo-bronchial tree of theovcrlving positive film. In the film, bony landmarks are not re- 230 FOREIGN BODIES IN AIR AND FOOD PASSAGES. liable because of the wide variation due to the phylogenetic recency ofthe upright posture. Xisceral landmarks are necessary. The two im-portant visceral landmarks are the dome of the pleura and the dome ofthe diaphragm. It is needless to say the tracheo-bronchial tree necessarilylies in the body of the lung between these two landmarks, and lines cor-responding to these are placed on the film. Twelve photographic enlarge-ments and reductions are on hand so that a film of the size (rather thanage) is available for any sized patient, the size being chosen by matchingthe size between the dome of the pleura and that of the diaphragm asshown on the radiograph of the patient. All this work is done, of course,in a darkened room, with a stronglv illuminated shadow-box; and in the. Fig. 167. ,!. on tlie left, aliscess (rctouclicd). On the right the abscessis localized in the right inferior lolje bronchus by the method of overlaying. Thelocalization coincided with the endoscopic findinuswhen the abscess was evacuatedbronchoscopically. event of the foreign body showing very faintly on the radiograph of thepatient, it is strengthened by an ink-mark on tlie uncoated side of thenegative, which can be readily erased afterwards if desired. Corroboration of the usefulness of these films has been forthcomingfrom a number of sources. (See article by R. C. Lynch in New UrleansMed. and Surg. Journal, Dec, 1913). To prevent error in the use of these films, as with any method ofinterpretation of a radiograph, it is necessary to be on guard againstfalse localization due to displacement of the lung by atelectasis, and es-pecially by the compensatory emphysema on the other side. Anothersource of error, of course, is that the
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrespira, bookyear1915
