. The American journal of roentgenology, radium therapy and nuclear medicine . Fig. 13. Multiple cavitation in right upper lobe. Pleu-risy at both bases. Plate made in 1917. degree of acti\it\ and of interpretingprogress. That skilled physicians are theones who should appreciate most of all thegraphic methods of radiology as an Fig. 14. Same patient two years later showing con-traction on the right side. A clearing up of the pleuralcondition in the left lower lobe. when subjected to one or more of thefollowing tests, has been pro\en to beanything but a cavitv. \\ hile not denying Annular Shado
. The American journal of roentgenology, radium therapy and nuclear medicine . Fig. 13. Multiple cavitation in right upper lobe. Pleu-risy at both bases. Plate made in 1917. degree of acti\it\ and of interpretingprogress. That skilled physicians are theones who should appreciate most of all thegraphic methods of radiology as an Fig. 14. Same patient two years later showing con-traction on the right side. A clearing up of the pleuralcondition in the left lower lobe. when subjected to one or more of thefollowing tests, has been pro\en to beanything but a cavitv. \\ hile not denying Annular Shadows: Are they Cavities or Spontaneous Pneumothoraces? 451 that a localized pneumothorax may show-as an annular ring form, the writer hasnever met such a spontaneous pneumo-thorax, although he has seen a good manyrecent ones m x-ray plates, none of whichpneumothoraces was to be confused withcavities, and none was round. Further-more, stereo plates of artificial pneumo-thorax where adhesions have limited theair to 100 or less, have never assumedthe appearance of these ann
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