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Observation of the tracheal lumen using a bronchoscope (a); Tracheal bifurcation is obstructed by pseudomembrane (a-1). Pseudomembrane was sampled with forceps (a-2). The fragments of pseudomembrane sampled by forceps (b). Thoracic computed tomography (CT) shows bilateral consolidations in the lung field, pneumomediastinum around the aortic arch and obstructed tracheal lumen (c). Gram staining (×1000) of organisms isolated from the pseudomembrane sample. Bar: 10 µm (d).
