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OBJECTIVE To explore the efficacy and safety of en bloc resection therapy on posterior fossa tumor in children. METHODS A retrospective analysis was conducted on the clinical data of 94 patients with posterior fossa tumor admitted to Department of Pediatric Neurosurgery, Xinhua Hospital Affiliated to Shanghai Jiaotong University School Of Medicine from January 2018 to December 2019. Among them, 35 cases were treated with traditional resection (control group) and 59 cases with en bloc resection (observation group). We counted the amount of blood loss and the time during tumor resection, We compare the symptoms and signs between the two groups and determine a extent of tumor resection based on microscopic observation and preoperative and postoperative imaging comparison. RESULT: The total tumor resection rate of the observation group (88.1%, 52 / 59) was significantly higher than that of the control group (62.85%, 22 / 35, P &amp;lt; 0.05). The average bleeding volume of 90.8ml in the observation group was significantly smaller than that of the control group (113.3ml, P &amp;lt; 0.05), and the average operation time of 38.6min in the observation group was shorter than that of the control group (57.4min, P &amp;lt; 0.05) only for tumor resection procedure. CONCLUSION En bloc resection technique can effectively accelerate the resection time, reduce intraoperative bleeding and improve the total resection rate of tumors in children’s posterior cranial fossa.

SURG-04. THE APPLICATION OF EN BLOC RESECTION IN THE OPERATION OF PEDIATRIC POSTERIOR FOSSA TUMOR