Typically a child between the ages of 1-4 will have acute onset of wheezing and a clinical suspicion of potential inhaled FB. In children who are old enough to cooperate the first test in an inspiratory and expiratory CXR, which will demonstrate air trapping on the expiratory view in the lung containing the FB, if present. An alternative for younger or non-cooperative children is bilateral lateral decubitus chest x-rays. The chest side down will act like the expiratory view and demonstrate air trapping in the lung containing the FB, if present. When a FB is tentatively diagnosed or still felt clinically to be likely the patient will receive either a CT scan of the chest or go directly to bronchoscopy. Either course of action is reasonable. Bronchoscopy is more invasive but allows diagnosis and therapeutic intervention. CT involves the risk of radiation and allows diagnosis (and possible exclusion) of chest pathology but no therapeutic intervention. A final choice of modality may depend on the plain film images and clinical history.