foreign body aspiration

• 80% ==> obstructive emphysema ("air trapping")
• 20% ==> obstructive atelectasis
• <1% ==> normal aeration

• normal bronchi dilate during inspiration
• the aspirated particle acts as a one-way valve

• decubitus or inspiratory/expiratory views

© 2002, C.E. Kahn, Jr.
2002-04-18