- Author: Deborah Watson, MD; Chief Editor: Arlen D Meyers, MD, MBA more...
A CT scan usually is obtained for concurrent reasons, such as assessing sinus disease or evaluating head and/or facial trauma. A deviated septum is readily apparent on a CT film (see the image below). While septal deviations are apparent on CT scans, obtaining a CT scan is not necessary in a patient in whom no other pathology is suspected (eg, concomitant sinus disease).
In addition, a study by Sedaghat et al indicated that CT-scan results do not correlate well with physical exam/anterior rhinoscopic/endoscopic findings in septal deviation. Although the study, which involved 39 patients, determined that such correlation was significant with regard to the bony septum, it was not significant with regard to the cartilaginous septum, maxillary crest, and nasal valve.
Plain films are not indicated in most instances; they do not help because the cartilaginous portion of a deviated septum is not easily visible. Direct examination always is best.
Many proposed methods of nasal airway analysis exist, including rhinomanometry, acoustic rhinometry, and nasal peak flow. The measurements derived from these methods are not always reproducible and do not consistently correlate with a patient's subjective complaint of nasal obstruction. In general, these types of studies are useful for research in nasal obstruction but provide little clinical value in the decision-making process regarding surgery or medical management.
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