Three different forms of Aspergillus tracheobronchitis have been described: obstructive bronchial aspergillosis, where thick mucous plugs filled with the fungus are found in the airways, but causing little mucosal inflammation and invasion; ulcerative tracheobronchitis, where there is focal invasion of the tracheobronchial mucosa and/or cartilage; and finally, pseudomembranous tracheobronchitis, where there is extensive inflammation and invasion of the tracheobronchial tree with the ..