Introduction : Olfactory groove meningiomas are usually resected via various skullbase approaches. In this report, a direct approach to the tumor via the endonasal route is described. Material and Method : Four patients presented with headache or seizure. Radiological images revealed olfactory groove meningioma associated with surrounding edema. The olfactory function examination revealed the hyposmia in all patients. All tumors were resected via endoscopic endonasal trans-ethmoidal approach. Results : The tumors were completely resected, including the dura of origin and bone. The skullbase reconstruction was performed with multi-layers fashion. There was no postoperative neurologic deficit except anosmia and morbidity including the leakage of cerebrospinal fluid. Conclusion : The endoscopic endonasal transethmoidal approach could be a safe and curative surgical approach to treating for olfactory groove meningiomas.
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