Abstract
Striking perfusion deficits were noted on the lung scans of 5 children who, despite aspiration of radiolucent foreign bodies, had normal physical findings and usually minimal x-ray abnormalities. Seven dogs, studied after endobronchial placement of partially occluding foreign bodies, likewise displayed positive perfusion lung scans. Scans reverted to normal following foreign-body removal. Plain films, angiograms, and blood gas studies were unremarkable. The findings suggest that the perfusion disturbance related to partially occluding foreign bodies occurs at the capillary level. Perfusion lung scanning is useful in the diagnosis of foreign body aspiration and may be negative for as long as 24 hours after aspiration.
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