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KMID : 1201420150080010016
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Journal of Neurocritical Care
2015 Volume.8 No. 1 p.16 ~ p.24
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Optic Nerve Sheath Diameter on Brain Magnetic Resonance Imaging: A Single Center Study
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Ko Sang-Bae
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Abstract
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Background: Optic nerve sheath diameter (ONSD) on ultrasonography is regarded as an indirect and non-invasive marker to estimate intracranial pressure (ICP). Despite its popularity in clinical use, no data exist on Korean patients without ICP crisis. The main purpose of this study was to measure ONSD in patients with apparently normal ICP using magnetic resonance imaging (MRI).
Methods: A consecutive 301 patients admitted to our institute who underwent MRI and/or magnetic resonance angiography (MRA) were included in this study. Source imaging with thin section slice was collected. ONSD was measured bilaterally using MIPAV software. Mean value was compared in terms of age, sex, and neurologic diagnosis.
Results: The mean age of the 301 patients was 59.7±17.8 years. There were 171 (56.8%) males. Indication of brain imaging was stroke (n=136, 45.5%), epilepsy (n=45, 15.0%), neuromuscular disorder (n=29, 9.6%), movement disorder (n=28, 9.3%), and others (n=62, 20.6%). No patient had suspicion of ICP increase due to mass effect. Mean ONSD on MRA was 4.37±0.52 mm (male: 4.42±0.49 mm; female: 4.32±0.54 mm) (P=0.09). ONSD was not significantly different according to age group or underlying disease.
Conclusion: The mean ONSD on MRI was 4.37 mm in patients with apparently normal ICP. ONSD was not significantly different in patients with different sex, age, or underlying disease.
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KEYWORD
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Optic nerve sheath diameter, Brain magnetic resonance imaging, Intracranial pressure
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