The MRI appearance of the optic nerve sheath following fenestration for benign intracranial hypertension |
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Authors: | D Sallomi H Taylor J Hibbert M D Sanders D J Spalton K Tonge |
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Institution: | (1) Guys and St. Thomas' Hospitals, Lambeth Palace Road, London SE1 7EH, UK, GB |
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Abstract: | Optic nerve fenestration is carried out in cases of severe benign intracranial hypertension. This study aimed to monitor
the optic nerve sheath appearances and orbital changes that occur following this procedure. The eight patients were all female
with an average age of 37.3 years and a range of 20–58 years. The duration of symptoms was 2–6 years. Symptoms included headaches,
diplopia and visual obscurations. Examination revealed severe papilledema. All investigations, including MRI, biochemical
and immunological tests, were negative. Patients had fenestration of a 2 mm × 3 mm segment of the medial aspect of the optic
nerve sheath. Imaging was obtained with a 1 T MRI machine using a head coil. Coronal, axial and sagittal 3 mm contiguous sections
using STIR sequences with TR 4900 ms, IT 150 ms and TE 60 ms were obtained. Five patients showed clinical improvement. The
post-operative MRI findings in four of these included a decreased volume of cerebrospinal fluid (CSF) around the optic nerve
sheaths and a localized collection of fluid within the orbit. There were no MRI changes in the three patients with no clinical
improvement. Decreased CSF volume around the optic nerve and a fluid collection within the orbit may indicate a favorable
outcome in optic nerve fenestration.
Received 23 June 1997; Revision received 16 January 1998; Accepted 18 March 1998 |
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Keywords: | : MRI Optic nerve fenestration Benign intracranial hypertension Pseudotumor cerebri |
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