Grading of Laryngeal Stenosis

Grade 1

Less than 70% obstruction

Grade 2

Between 70% and 90% obstruction

Grade 3

Tight subglottic stenosis with pinhole opening Greater that 90% obstruction Recognizable vocal cords

Tight glottic and subglottic stenosis with 90% obstruction. Vocal cords not recognizable

Posterior glottic scarring, with tethering of the posterior glottic structures. Note the absence of a posterior mucosally lined tract, which differentiates this lesion from webbing between the vocal processes of the arytenoids.

Grade 4

Complete laryngeal obstruction with no recognizable true vocal cords and no lumen.

Source: Laryngoscope 101: December 1991
Cotton: Pediatric Laryngotracheal Stenosis

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