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A 40-year-old man presented with quadriparesis. He had cerebral palsy and a history of diffuse idiopathic skeletal hyperostosis. Preoperative three-dimensional computed tomography reconstruction shows right atlas lateral mass erosion and atlantoaxial subluxation (A). He underwent atlantoaxial fixation with C1 lamina hook and lateral connector due to C1 lateral mass erosion (B), (C).
