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Radiological and histopathological findings of tracheal cartilaginous sleeve in a patient with Beare‐Stevenson syndrome. (a). 3D construction image of chest CT scans showed tracheal cartilaginous sleeve on the right side dorsally. (b). The trachea was irregularly dilated with a pouch‐like deformity (arrow). Malformed cartilaginous islands (c) and inflammatory cell infiltrate with hyperplastic glands (d) were observed in the tracheal wall. Further details can be seen in the original article by Seki et al. in this issue.