Figure 3.

(A) Axial T2 image of the lumbar spine showed marked atrophy of paraspinal muscles (black arrow) bilaterally with increased T2 signals in keeping with fatty replacement. There was also moderate atrophy of psoas (white arrow head) and quadratus lumborum (black arrow head) on both sides. (B) Axial T2 image of the same patient performed 6 months after the initial MRI confirmed persistent fatty atrophy of the paraspinal muscles (black arrow) bilaterally. There was a further very mild increase of atrophy of quadratus lumborum (black arrow head) on both sides. Both psoas (white arrow) did not show any significant change.