[The mucoid impaction and the "mucous bronchogram" (author's transl)].

Intrabronchial retention of large plugs of inspissated mucous in cases of disturbed bronchial secretion and impaired clearing mechanism leads often to chronic inflammation and to formation of "proximal" bronchiectasis. Mucoid impaction may occur in many bronchial diseases and is radiologically characterized by the so-called "mucous bronchogram".