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chest chest radiology tracheal tumors tracheal dilatation tracheal stenosis tracheobronchomegaly relapsing polychondritis tracheobronchomalacia tracheomalcia ct chest imaging respiratory large airways ct chest trachea lung computed tomography airways pulmonary hemothorax thoracic imaging ultrasound normal pleura us thorax pleura empyema pneumothorax pleural effusion thoracic ultrasonography thoracic ultrasound thoracic us pleural imaging pleural sonography pleural us pleural ultrasound pulomary