fig1

Figure 1. Brain and spine image and electromyography of the ALS case. (A) Brain MRI suggests Arnold-Chiari malformation type I (arrow). Spine MRI reveals slight prominence of intervertebral disks at C4/5, C6/7 and L4/5-L5/S1, and no abnormality was observed in the whole spinal cord. (B-D) Electromyography showed denervation potentials in the left biceps brachii (B), the left thenar muscle (C) and right gastrocnemius (D). ALS: amyotrophic lateral sclerosis; MRI: magnetic resonance imaging