The widely held concept that glass must contain lead or other heavy metals to be seen radiographically is invalid; all glass, regardless Fig. 1. Fragment of unknown type of glass. Removed surgically. of type or lead content, is radiopaque and should be visible on a properly exposed and positioned radiograph. By varying the position and obliquity of the part to be x-rayed, the glass fragment may be thrown free of overlying structures. It is apparent that the chances of demonstrating glass on a radiograph will depend to some extent on the relative size of the fragment to that of the part examined, but the density of any fragment should be sufficient to differentiate it from surrounding tissue. In the usual clinical situation wherein one must decide on the presence or absence of glass in soft tissue, a properly positioned and exposed radiograph should provide the answer.
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