Efficacy of preoperative laryngogram for localization of the ventricle at the anterior commissure

Abstract The localization of the ventricle exactly above the anterior commissure of the vocal cords is important in performing supraglottic laryngectomy. The lateral projections of pre‐operative laryngograms are examined and the following two dimensions are measured on the film: (1) distance between the bottom of the thyroid notch and the inferior border of the thyroid cartilage and (2) distance between the anterior part of the ventricle and the inferior border. The ratio of these two distances is obtained and is designated as distance ratio (DR). The DR is similarly calculated from the actual measurements of the laryngeal specimens and is compared with the DR based on the laryngograms. Differences between these two DR's are nonsignificant (0.5