Type I Centrally located lesion, produced from shearing between the lung parenchyma and the tracheobronchial tree
Type II Tubular lesion, located at the lower lobes; the lower chest is suddenly compressed, squeezing the lower lobes against the vertebral bodies
Type III Small, rounded and peripherally located, frequently associated with rib fractures and pneumothorax
Type IV Shearing of the lung from traction of previously formed pleuropulmonary adhesions over the parenchyma