Hina Rehman, Muhammad Saim Khan, Muhammad Nafees, Attiqueur Rehman, Asad Habib.
Optic Nerve Sheath Diameter on Sonography in Idiopathic Intracranial Hypertension Versus Normal.
J Coll Physicians Surg Pak Jan ;26(9):758-60.

Objective: To compare the mean optic nerve sheath diameter (ONSD) in patients with idiopathic intracranial hypertension (IIH) versus normal healthy individuals using B-scan ultrasonography as diagnostic tool. Study Design: Cross-sectional analytical study. Place and Duration of Study: Armed Forces Institute of Radiology and Imaging, Rawalpindi, Pakistan, from June to December 2015. Methodology: Participants aged 30 - 50 years were divided into two groups. Group A (GP) comprised of patients who were diagnosed cases of idiopathic intracranial hypertension while normal healthy adults who volunteered to participate in the study were included in Group B (GC). Ocular B mode ultrasound scan was performed on all the participants and each eye was considered separately. The optic nerve head was visualized as a linear hypoechoic structure, and ONSD was measured 3 mm behind the retina. A total of three readings were taken by the same radiologist and the average of three was recorded. Mean values of both groups were compared by t-test with significance at p < 0.05. Results: Fifty-two eyes of 26 patients (26 eyes in each group) were included in the study. Twenty-four out of 26 in Group A (GP) and 23 out of 26 in Group B (GC) were females. Mean age of the patients was 33.92 ±4.89 years in group A (GP) while it was 34.69 ±4.79 years in group B (GC). Mean ONSD was 6.61 ±0.39 mm in group A (GP) and 4.33 ±0.38 mm in group B(GC) which was significantly different (p < 0.001). Conclusion: Ultrasound can provide a reliable, non-invasive tool to measure optic nerve sheath diameter in monitoring the patients with benign intracranial hypertension (BIH).

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