The detection and demonstration of nonopaque foreign bodies in the esophagus is a frequent and treacherous problem in roentgenology. By far the most common offender is a small piece of bone from a fowl or fish. These bones, which are usually from young animals and are consequently incompletely ossified and calcified and in which the calcium content has been further reduced by cooking, are relatively nonopaque to x-rays. The bone most frequently encountered, according to the Jacksons1 and in our experience, is a fragment of the sternum of a chicken. A piece of rib is next in order.
Another type of radiolucent foreign body is buttons, many of which are transparent to roentgen rays and require the aid of a barium mixture for their visualization. A firm bolus of food, especially meat, is a third type of radioparent foreign body when halted in its passage by inherent or adjacent
SCOTT WG, MOORE S. A METHOD OF ROENTGEN DIAGNOSIS OF NONOPAQUE FOREIGN BODIES IN THE ESOPHAGUS. JAMA. 1936;106(11):906–908. doi:10.1001/jama.1936.02770110022007
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