MRI findings in a case of spinal cord Wallerian degeneration following trauma

Sagittal T2W a) image of intial MRI at the time of injury shows cord contusion at C3 to C4-5 levels appearing hyperintense (White arrow), b, a) image of MRI done after 6 months with sharpened contrast shows focal syrinx at C4-5 level (white arrow) with long segment abnormal hyperintense signal in dorsal column superiorly extending upto cervicomedullary junction (black arrow). Axial T2W c) at C2-3 level showing hyperintense signal in dorsal column (white arrow). d) image at C6-7 level showing hyperintense signal in lateral cortico-spinal tracts (dotted white arrows). Coronal STIR images e) showing syrinx at C4-5 level with wallerian degeneration changes cranial and caudal to it (white arrows).