Intracranial schwannomas predominantly arise from the 8th cranial nerve, and less commonly from the 5th, 9th, 10th, and 7th cranial nerves. Herein, we describe the clinical features and surgical management of orbital schwannomas. A 64-year-old woman and 45-year-old woman were admitted to our hospital with complaints of proptosis. In particular, visual field defects and decreased visual acuity were demonstrated in the 64-year-old patient. A CT scan showed low density lesions within the orbital canal. MR imaging revealed a low signal intensity on the T1-weighted scan, and a high signal intensity on the T2-weighted scan with heterogenous enhancement. The tumors were totally resected via an orbitocranial approach. The histopathological finding was neurilemmoma. It was found in one patient that the tumor originated from the lacrimal nerve. In the other patient, the tumor originated from the frontal branch of the trigeminal nerve. There was minimal sensory change in the periorbital area in the case of the schwannoma which originated from the trigeminal nerve and a visual field defect remained in the case of the patient with the lacrimal schwannoma. Even though schwannomas have been reported to originate from all cranial nerves, except the optic nerve, most arise from the vestibular nerve. We reported two cases of orbital schwannoma which originated from the lacrimal nerve and the frontal branch of the trigeminal nerve, respectively.
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