Introduction Intraoperative ultrasonography (IOUSG) is an important imaging modality used during central nervus system tumor surgeries. It helps the surgeon to identify tumor borders during surgery and avoids unnecessary resection. It is also used for many years in surgery of spinal intradural tumors. The aim of this study is to review our experince gained from the use of IOUSG in intraadural spinal tumor surgery. Materials and Methods IOUSG was used durging surgery of 69 intradural spinal tumors, operated between 2012 to 2016. 5-8 MHz probe of IOUSG was used, before and after durotomy to perform the exact durotomy and myelotomy, and after tumor resection, to detect a tumorrest. Many parameters, including demographics, localizations, histopathologies, IOUS findings, and amount of tumor resection were reviewed retrospectively. Findings IOUSG was used during surgery of 69 intradural spinal tumor (42 extramedullary, and 27 intramedullary tumors). Total excision could be performed in 68 cases, and subtotal excision in one case. Pre-durotomy IOUSG showed sufficient laminectomy in 62 cases. In seven cases IOUSG failed to show all borders of tumor, therefore laminectomy was extended. Conclusion IOUSG is important tool, contributing to intradural spine surgery. This modality shows tumor appearance before durotomy, therefore is helpful in deciding amount of laminectomy and duratomy as well as the exact location of myelotomy. It also inform surgeon about the tumor rest after excision, therefore increases safety and excellence of the surgical procedure. Keywords Intradural spine tumor, intraoperative ultrasonography, spine surgery