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The dangers attending the lodgment of a foreign body in the lower air passages are greatly enhanced when the body in question happens to be of a friable nature. Peanuts are particularly dangerous for several reasons: 1. Owing to its size and shape, a peanut may effectually plug a bronchus so as to produce bronchiectasis affecting a major portion or even an entire lobe. 2. Being smooth, it is liable to frequent displacement from its original location, giving rise to continued irritation of the bronchial mucosa, with attendant swelling and profuse secretion. 3. Being permeable to the roentgen ray, it cannot be located by fluoroscopy. 4. It is frequently inhaled in fragments, which scatter through the various fine bronchioles where they can neither be located nor removed, and where they set up a fatal pneumonia. 5. Being speedily softened by the secretions, they offer no resistance to the grasping forceps,
Salinger S. PEANUT IN THE LOWER AIR PASSAGES. JAMA. 1923;81(19):1609. doi:10.1001/jama.1923.26510190001015