title: Orbital optic glioma in neurofibromatosis. Magnetic resonance diagnosis of perineural arachnoidal gliomatosis.
abstract: In a patient with neurofibromatosis and orbital optic glioma, T2-weighted axial magnetic resonance images showed a fusiform area of high signal intensity with a central linear core of lower signal intensity. Computed tomographic images did not show a corresponding variation in tumor density. Histopathologic examination of the tumor revealed dense, circumferential, perineural glial proliferation. This "arachnoidal gliomatosis" is a feature of orbital optic gliomas in neurofibromatosis and, in our magnetic resonance scans, accurately corresponded with the region of high signal intensity within the tumor.
mesh_terms: D001099:Arachnoid / Q000473:pathology*; D002675:Child, Preschool; D005260:Female; D005910:Glioma / Q000175:diagnosis / Q000000981:diagnostic imaging / Q000209:etiology* / Q000473:pathology; D006801:Humans; D008279:Magnetic Resonance Imaging; D009456:Neurofibromatosis 1 / Q000150:complications*; D009457:Neuroglia / Q000473:pathology; D009901:Optic Nerve Diseases / Q000175:diagnosis / Q000000981:diagnostic imaging / Q000209:etiology* / Q000473:pathology; D009918:Orbital Neoplasms / Q000175:diagnosis / Q000000981:diagnostic imaging / Q000209:etiology* / Q000473:pathology; D014057:Tomography, X-Ray Computed