Unilateral Biportal Endoscopic Resection of Thoracic Hemivertebra in a Child: A Case Report Highlighting Technical Feasibility and the Critical Importance of StabilizationPeng Zhang 1, Chengyun Wang2, Zijie Sun1, Zhangyong Tan1, Kefeng Xu1, Genyang Jin1, Qi Liu21Department of Orthopedics, The 904th Hospital of Joint Logistic Support Force of PLA, Wuxi, China;2Department of Pediatric Orthopedics, The First Affiliated Hospital of Xiamen University, Xiamen, China