• Wanjin Qin, Peng Yang, Feng Zhou, Haiqing Mao, and Huilin Yang.
• Department of Orthopedic Surgery, First Affiliated Hospital of Soochow University, Suzhou, China.
• World Neurosurg. 2020 Nov 1; 143: 419-422.

BackgroundAndersson lesion (AL) is not a rare complication of ankylosing spondylitis (AS), but it seldom occurs in single lumbosacral segments or young people. We present a case of a young patient with AS and AL between L5 and S1.Case DescriptionA 30-year-old man with a history of AS presented with AL between L5 and S1. Surgery performed under O-arm navigation was successful. At 6-month follow-up, the patient's pain was reduced, and his function had improved.ConclusionsAL rarely occurs in the lumbosacral region or in young people and can be misdiagnosed as spinal tuberculosis. Surgical treatment of AL aims to relieve spinal nerve compression, reconstruct spinal stability, and restore sagittal balance. In view of the ambiguous anatomic landmark of patients with AS, we recommend surgery assisted with O-arm navigation, which clearly showed the entry point and guaranteed the accuracy of pedicle screw placements.Copyright © 2020 Elsevier Inc. All rights reserved.

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