M, 34 days, right upper limb weakness for 1 month. Muscle strength was graded 0. EMG showed neurogenic damage to the right brachial plexus. Coronal 3D-STIR-SPACE image displayed thickening of the right nerve root at C5 and C6 level (thin arrow), right nerve root dissection at C7 and C8 level (thick arrow), and increased signal of right shoulder and upper limb muscles (arrowhead).