A case in which broken pieces of glass are able to move freely in the pleural cav i t y without causing fatal or severe injury is very rare. I describe a case in which two pieces of glass which had penetrated the pleural cavity of a 14-year-old boy were surgically r e m ove d. Initial chest radiograph showed two crossed opacities in the right lateral chest wall around the minor fissure, while follow-up chest radiographs revealed mi-gration of a vertical piece of glass to the right lower lateral thorax and finally to the right lower medial thorax.