Most bronchial foreign bodies (including foods and plastics) don’t contain metal or glass, and therefore can’t be seen on normal Xrays.
Special Xrays (taken during Inspiration and Expiration) may show air trapping in one lung, beyond a “radiolucent” foreign body.
In this case, the Xray taken during Inspiration looks normal, even though a peanut is partially obstructing the patient’s right main bronchus.
During Expiration, the right lung can’t deflate properly. This causes the heart to shift far to the patient’s left (towards the right of your computer screen).
The presence of older siblings in the household increases the risk for choking, possibly because toys and other objects with small parts are more likely to be present and caregiving activities, such as feeding, to be undertaken by older siblings.[Ref:44]