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Until now, as far as we can judge, we have had no recurrences of tumor caused by transconioscopy, but we are aware of the risk.
In order to avoid the risk of tumor implantation in the prelaryngeal tissue by transconioscopy, Dr. Tucker suggests inspection of the subglottic space by inserting the telescope through a tracheotomy by which the same view might be obtained.
We have used that technique a few times and of course the risk of tumor implantation will diminish with increasing distance from the vocal cords, but so will the possibility of detailed inspection. In our experience the view through the tracheotomy is poor compared with that through the cricothyroid membrane, so much more as the lighting with increasing distance gets sparser.
SORENSEN H. TRANSCONIOSCOPY-Reply. Arch Otolaryngol. 1971;93(5):541. doi:10.1001/archotol.1971.00770060786024
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