PMC4105106_01
A chest X-ray taken on admission. The chest X-ray image indicated narrowing of the trachea (arrows).
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F1
His carboxyhemoglobin concentration was 3.3% on admission.Chest X-rays indicated narrowing of the trachea (Figure 1).
The transverse view of the tracheal US on admission. The US image showed hypoechoic thickening of the tracheal wall at the level cranially adjacent to the thyroid isthmus (arrows). T indicates the thyroid gland.
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F2
The thickness from the outer edge of the hypoechoic tracheal ring to the outer edge of the hyperechoic air-mucosa interface was 9.0 mm (Figure 2).
The CT scan performed on admission. The CT image showed thickening of the tracheal wall (arrows). T indicates the thyroid gland.
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F3
The thickening was subsequently confirmed by a non-enhanced computed tomography (CT) scan (Figure 3), in which no pulmonary parenchymal injury was observed.
A transverse view of tracheal US obtained at the same level 2 days after admission. The US image showed remission of the tracheal wall thickening (arrows). T indicates the thyroid gland.
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F4
The thickness at the same level was 2.9 mm (Figure 4).