Radical excision of olfactory groove meningioma is the goal of microsurgery but faces some challenges such as the hypersostotic bone and paranasal sinus invasion with resulting Cerebrospinal Fluid (CSF) leak and infection making high recurrence rate. Aim of Study: The aim of the present study was to identify factors predicting the outcome for patients with a diagnosis of OGMs undergoing microsurgical resection and to examine whether there is a general benefit of such microsurgery. Patients and

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... ethods: A total number of 28 patients were microsurgically operated for OGMs at the Neurosurgery Results: No patient characteristics, such as age, sex or presenting symptoms could be considered predictive for the post-operative outcome. Of the tumor-related characteristics only the presence of skull base invasion and the Simpson grading of removal were considered negative predictors for the outcome. Conclusions: Microsurgical removal of the OGMs is effective and save with very little morbidity and low risk of post-operative recurrence provided that it is done totally with complete reconstruction of the skull base.