Primary orbital schwannomas.

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Abstract
Seven histologically proved [human] cases of primary orbital schwannoma were seen at the University of British Columbia Orbital Clinic [Vancouver, Canada] between Sept. 1976 and Dec. 1980. Their varied clinical presentations, preoperative investigations, operative findings and appearances on light microscopy and EM are described. Although no single feature is pathognomonic, a multiplicity of clinical, radiographic and surgical features point to this lesion. Computed tomography was the most helpful means of preoperative investigation, especially in localizing the lesion. Of the 7 tumors, 4 were intraconal and 3 were extraconal. The surgical approach was dictated by tumor site and included anterior, lateral and panoramic orbitotomies. At surgery the nerve of origin of 4 of the tumors was identified. All tumors were excised totally or subtotally. There has been no recurrence to date.