PMC6243369_01
Axial non-contrast-enhanced CT image at the level of the cricoid cartilage (a) shows a discontinuous posterior ring with an isolated sclerotic component (arrow). There is diffuse soft tissue swelling, encroaching on the air column (triangle). (b) An additional axial image shows bone fragments (arrow). (c) Sagittal reconstruction demonstrates a hypodense postcricoid soft tissue swelling (triangle) with multiple bone fragments (arrow).
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fig1
The cricoid ring was incomplete, fragmented with sclerotic components within the soft tissue density (Figure 1).
Coronal minimal intensity projection (a) shows a diffuse soft tissue swelling (black arrow) centred around the posterior arch of the cricoid cartilage with reduction in the airway calibre. (b) Axial CT image showing the cricoid bone fragment with the soft tissue swelling (open arrow). (c) Endoscopic view of the subglottic region from volumetric CT data, viewed caudocranially towards the subglottic region (inset) shows diffuse soft tissue swelling along the posterior wall of the subglottic trachea (arrow).
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fig2
The extent of narrowing of the air column and soft tissue bulge along the posterior wall of the subglottic trachea was well illustrated with a coronal image and a surface-rendered three-dimensional reconstruction (Figure 2).