184 – Subglottic stenosis

Subglottis: at short distance from the vocal cords a simple stenosis, in diaphragm, considerably reduces the light.

Ventilation is possible thanks to a central and circular hole, with a small marginal nodule.

The same volume of inhaled air must increase its speed to enter through a narrow light, becoming turbulent, which causes visible hyperemia in the mucosa.

185 - Simple stenosis

Enlarged photograph of the case.
Note the thin and taut edges of the central diaphragm hole.
Almost always yield immediately to the dilation maneuvers.

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