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Journal of Radiological Review 2020 January-February;7(1):1-4

DOI: 10.23736/S2723-9284.20.00258-2

Copyright © 2020 EDIZIONI MINERVA MEDICA

language: English

Usefulness measuring of the optic nerve sheath by ultrasound for the diagnosis of idiopathic intracranial hypertension

Daniel I. HERRERA LEBLANC , Elizabeth A. BUSTOS

Department of Imaging, Instituto Mexicano del Seguro Social, Monterrey Unidad Medica de Alta Especialidad, Monterrey, Mexico


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BACKGROUND: The idiopathic intracranial hypertension (IIH) is an increase of intracranial pressure, the signs of which can be detected by image. Ultrasound measurement of the optic nerve sheath evaluates acute intracranial pressure. The aim of this study was to evaluate the usefulness of measuring the optic nerve sheath in patients with a diagnosis of headache who present findings suggestive of IIH on magnetic resonance imaging (MRI) or computed tomography (CT).
METHODS: Observational, prospective, transverse and analytical. The optic nerve sheath will be evaluated by ultrasound to patients with a diagnosis of headache who present with incidental image findings of IIH by MRI and CT. With a sample of 41 patients. Calculating the sensitivity and specificity.
RESULTS: The sensitivity and specificity of the optic nerve sheath obtained by ultrasound in patients with imaging findings of idiopathic intracranial hypertension was 45% and 76% respectively, with a positive predictive value of 64% and a negative predictive value of 61%. The specificity and negative predictive value increases up to 92% and sensitivity up to 60% by including two findings suggestive of IIH.
CONCLUSIONS: The measurement of the optic nerve sheath by ultrasound for the detection of idiopathic intracranial pressure has a low sensitivity and moderate specificity. However, the specificity and negative predictive value increases when patients present two findings suggestive of HII. Patients with suspicious imaging findings of IIH who underwent additional measurement of the optic nerve sheath by ultrasound to measure intracranial pressure would help us provide an early diagnosis.


KEY WORDS: Optic nerve; Pseudotumor cerebri; Ultrasonography

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