• Maja Formo, Charlotte Marie Halvorsen, Daniel Dahlberg, Tor Brommeland, Hege Fredø, John Hald, David Scheie, Iver A Langmoen, Bjarne Lied, and Eirik Helseth.
• Faculty of Medicine, University of Oslo, Oslo, Norway.
• Neurosurgery. 2018 Mar 1; 82 (3): 365-371.

BackgroundTo date, the traditional approach to intraspinal tumors has been open laminectomy or laminoplasty followed by microsurgical tumor resection. Recently, however, minimally invasive approaches have been attempted by some.ObjectiveTo investigate the feasibility and safety of minimally invasive surgery (MIS) for primary intradural spinal tumors.MethodsMedical charts of 83 consecutive patients treated with MIS for intradural spinal tumors were reviewed. Patients were followed up during the study year, 2015, by either routine history/physical examination or by telephone consultation, with a focus on tumor status and surgery-related complications.ResultsMean age at surgery was 53.7 yr and 52% were female. There were 49 schwannomas, 18 meningeomas, 10 ependymomas, 2 hemangioblastomas, 1 neurofibroma, 1 paraganglioma, 1 epidermoid cyst, and 1 hemangiopericytoma. The surgical mortality was 0%. In 87% of cases, gross total resection was achieved. The complication rate was 11%, including 2 cerebrospinal fluid leakages, 1 asymptomatic pseudomeningocele, 2 superficial surgical site infections, 1 sinus vein thrombosis, and 4 cases of neurological deterioration. There were no postoperative hematomas, and no cases of deep vein thrombosis or pulmonary embolism. Ninety-three percent of patients were ambulatory and able to work at the time of follow-up.ConclusionThis study both demonstrates that it is feasible and safe to remove select, primary intradural spinal tumors using MIS, and augments the previous literature in favor of MIS for these tumors.

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