An 85-year-old woman presented to hospital in March 2012 for evaluation of left leg weakness. On the day of admission she had noticed weakness and clumsiness in the left leg that had come on over several hours and had worsened to the point that she was unable to walk. The leg felt numb and heavy. There were no symptoms in the right leg or upper limbs, no back pain and no sphincter disturbance. Several years previously, she had developed shingles affecting a mid-cervical dermatome, complicated by seg-mental muscle weakness that had slowly improved with time. Her health was otherwise good and she was physically active.
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