Fig. 11

a Transverse HRUS shows partial loss of fascicular architecture with nerve thickening in the CPN (white arrowheads in panel on the left) soon after its origin from the sciatic nerve in a patient with post-traumatic foot drop with concomitant osteomyelitis. Also note the increased vascularity in the nerve suggestive of neuritis. The CPN was discontinuous with formation of this ‘end neuroma’. The panel on the right shows the distal segment of the discontinuous CPN which is hypoechoic and thickened (red arrowheads). b PDFS MR axial image shows pseudoneuroma with partially preserved fascicular architecture (encircled in red) with surrounding oedema, with distal segment showing hyperintensity (red arrowhead). There is hyperintensity in the peronei muscles (asterisk) suggestive of failure of regeneration. c Thickened hypoechoic median nerve (between arrowheads) with loss of continuity (arrow) in a case with penetrating injury to the forearm. d Axial T1-weighted image shows loss of fascicular architecture with hypointense neuroma formation (arrowheads) at the distal cut end of the proximal segment. e Sagittal PDFS image shows hyperintense median nerve (arrowheads) with focal loss of continuity which is seen as linear hyperintensity (red arrow) in the same patient