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A 14‐year‐old girl with severe scoliosis undergoing posterior spinal correction surgery (A, B). The cervical syrinx (C) was detected at preoperative spinal MRI. The SSEP waveform of the left lower extremity failed during surgery (D), whereas reliable SSEP waveform of the right lower extremity and MEP waveforms of the bilateral lower extremities were obtained (E, F, G)
