Figure 2 A 51-year-old female patient, admitted to the Emergency Department after a traffic accident, was found to have a type II rib fracture. (A, B) Schematic diagram of type I fracture in the inflammatory stage and the callus-forming stage. (C) At 33 days after the trauma, intraosseous callus formation (arrow) in the left third rib and no obvious cortical fracture were observed in the CT rescanning, oblique-axial plane. (D) On the day of the trauma, CT scanning revealed no obvious abnormalities of the third rib. (E, F) MRI 2 days after the trauma showed intramedullary high-signal intensities (arrow) on T2-STIR and T2-SPAIR sequences with oblique-axial scanning.