Classification Description Notes
Type 1 Parenchymal round cavity air or air/fluid-filled Barotrauma
Type 2 Paravertebral ovoid cavity, air or air/fluid-filled Shearing injury of lung against vertebra
Type 3 Peripheral cavity, deep to rib fracture Generally associated with pneumothorax
Type 4 Associated with prior adhesions Diagnosed only at surgery or autopsy



Wagner, R. B., et al. (1988). “Classification of parenchymal injuries of the lung.” Radiology 167(1): 77-82.