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Frontal chest radiographs of two infants presenting with foreign bodies lodged in the oesophagus at the level of the aortic arch (magnified inset). (a) Round object, solid from edge to edge—2p coin. (b) Round object with peripheral “double rim” or “halo”—button battery. (c) The “step-off” of the smaller negative pole is demonstrated on a lateral projection radiograph.
