case_images: PMC4929096_01
case_images: a Preoperative frontal X-ray of the right 95  thoracic scoliosis. b Postoperative frontal X-ray after index procedure. c Postoperative frontal X-ray after revision procedure and screw removal
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case_images: PMC4929096_01_40064_2016_2334_Fig1_HTML.jpg
case_images: Fig1
case_images: The decision was made to decrease the intensity of correction by contouring the rods (Fig. 1b).
case_images: Results of sensitive evoked potentials (SEP) after stimulation of both posterior tibial nerves at various times of the surgery. a Results during screws placement, b results during first rod insertion, c results during second rod insertion and spinal curve correction showing a decrease of cortical amplitudes and increase of latencies, d results at the end of the surgical procedure with improved amplitudes and normal latencies
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case_images: Fig2
case_images: SEP responses decreased considerably. SEP amplitudes decreased 90 %, while latencies increased significantly (Fig. 2).
case_images: CT scan showing the gross misplacement of the pedicle screw, which crossed the center of the vertebral canal on axial (a), coronal (b) and sagittal (c) planes. d Same sagittal plane of spinal MRI showing an increased diameter of the syrinx adjacent to a left T5 pedicle screw crossing the spinal canal
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case_images: Fig3
case_images: Axial, sagittal and coronal planes of a thoracolumbar CT scan confirmed the gross misplacement of the pedicle screw, which crossed the center of the vertebral canal (Fig. 3a-c). Spinal MRI was performed to check the C6 to T7 syringomyelia, which showed an increased diameter of the syrinx adjacent to a left T5 pedicle screw crossing the spinal canal (Fig. 3d).
case_images: SEP monitoring showing altered responses at 6 months (b), with decreased amplitudes and increased latencies compared to preoperative values (a). SEP control at final
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case_images: PMC4929096_01_40064_2016_2334_Fig4_HTML.jpg
case_images: Fig4
case_images: SEP monitoring showed altered responses, with decreased amplitudes and increased latencies (Fig. 4). SEP explorations performed at final follow-up showed similar responses to those performed before the initial surgery for scoliosis correction (Fig. 4), and final MRI confirmed the stability of syringomyelia.