COMPARATIVE STUDY BETTWEEN VIRTUAL LARYNGOSCOPY AND DIRECT LARYNGOSCOPY IN DIAGNOSIS OF CANCER LARYNX
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The purpose of this study was to evaluate the accuracy, clinical value and limitation of virtual laryngoscopy in diagnosis of cancer larynx in comparison to direct laryngoscopy with histopathological correlation. Thir ty patients diagnosed clinically and proved pathologically as iaryngeal carcinoma were subjected to fiberoptic endoscopy (FO), biopsy, spiral computed tomography (CT), and virtual laryngoscopy (VL). The accuracy of fiberoptic endoscopy, virtual laryngoscopy and CT was estimated with pathological correlation. It was found that, the accuracy of fiberoptic en doscopy, virtual laryngoscopy and CT for detection of the site of the le sion was different Regarding to the epigioWs, the accuracy ofFO, VL and CT, were Wfflb. As for the false vocal cord, the accuracy of FO was 81% while CT and VL were 100%. For the ventricle, the accuracy ofFO was 71% while VL and CT were 100% .For the true vocal cord, the accuracy ofFO was 70% while in CT and VL was 100%. For the anterior commis sure, the accuracy ofFO was 72%, VL was 94% and CT was 100%. For the posterior commissure, the accuracy ofFO was 50%, VL was 83% and CT was 100%. For the subglottic region, the accuracy of FO was 62% while 100% in virtual and CT. For the vallecullae. the FO, VL and CT showed the same accuracy, 100%. in conclusion, virtual laryngoscopy is sensitioe in assessment of the larynx beyond the large supraglottic and glottic masses obscuring the view off iberoptic endoscopy.