case_images: PMC4105106_01
case_images: A chest X-ray taken on admission. The chest X-ray image indicated narrowing of the trachea (arrows).
case_images: 2036-7902-6-11-1.jpg
case_images: PMC4105106_01_2036-7902-6-11-1.jpg
case_images: F1
case_images: His carboxyhemoglobin concentration was 3.3% on admission.Chest X-rays indicated narrowing of the trachea (Figure 1).
case_images: 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.
case_images: 2036-7902-6-11-2.jpg
case_images: PMC4105106_01_2036-7902-6-11-2.jpg
case_images: F2
case_images: 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).
case_images: The CT scan performed on admission. The CT image showed thickening of the tracheal wall (arrows). T indicates the thyroid gland.
case_images: 2036-7902-6-11-3.jpg
case_images: PMC4105106_01_2036-7902-6-11-3.jpg
case_images: F3
case_images: The thickening was subsequently confirmed by a non-enhanced computed tomography (CT) scan (Figure 3), in which no pulmonary parenchymal injury was observed.
case_images: 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.
case_images: 2036-7902-6-11-4.jpg
case_images: PMC4105106_01_2036-7902-6-11-4.jpg
case_images: F4
case_images: The thickness at the same level was 2.9 mm (Figure 4).