Indications for transconioscopy.

Transconioscopy is a reliable method for the diagnosis of even minimal subglottic tumor extension. The technique is briefly described. Transconioscopy has been performed at Karolinska Hospital in more than 400 cases of laryngeal carcinomas without any complications. It is not associated with any risk of spreading of the tumor if performed on proper indications. It is always indicated in glottic carcinomas where a subglottic extension is not visible by direct laryngoscopy but not in the more advanced cases where the subglottic part of the tumor can be visualized by direct laryngoscopy.