Common bony densities mimicking chest disease.

Images of bony densities on routine chest radiographs may simulate intrathoracic disease processes. Such entities include images produced by normal anatomic structures, anatomic variants, and benign processes. Most commonly, chest disease was simulated by virtue of projection or poor visualization of the bony density in question on the routine chest radiograph. The true nature of the "abnormal" images produced was usually revealed by further roentgenographic evaluation using specialized radiographic technics or additional views.