Radiolucent foreign bodies.
D004064:Digestive System / Q000000981:diagnostic imaging*; D005547:Foreign Bodies / Q000000981:diagnostic imaging*; D006801:Humans; D011095:Polyethylenes; D011137:Polystyrenes; D011145:Polyvinyls; D011859:Radiography; D012137:Respiratory System / Q000000981:diagnostic imaging*
D011095:Polyethylenes; D011137:Polystyrenes; D011145:Polyvinyls