Figure 21.

Case 2 Acute mTBI imaged 21 h and 64 h post-injury. Narrow mD dSIR images. On the images obtained at 21 h post-injury, extensive high signal abnormalities are seen in most of the white matter with sparing of the anterior and posterior central corpus callosum and peripheral white matter of the cerebral hemispheres (left column). On the images at 64 h post-injury, normal low signal white matter is seen in the hemispheres (right column). The images show marked regression of abnormalities over 43 h (i.e., just less than two days). The boundaries between white and gray matter and around the lateral ventricles become more obvious after regression of whiteout sign from grade 4 (left column) to grade 1 (right column).