Optic Nerve Sheath Diameter on Sonography in Idiopathic Intracranial Hypertension Versus Normal.
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.


METHODS
Cross-sectional analytical study.


METHODS
Armed Forces Institute of Radiology and Imaging, Rawalpindi, Pakistan, from June to December 2015.


METHODS
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. Atotal 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).


CONCLUSIONS
Ultrasound can provide a reliable, non-invasive tool to measure optic nerve sheath diameter in monitoring the patients with benign intracranial hypertension (BIH).
Department of Radiology, Armed Forces Institute of Radiology and Imaging, Rawalpindi.
Hina
H
Rehman
Department of Ophthalmology, Armed Forces Institute of Ophthalmology, Rawalpindi.
Muhammad Saim
MS
Khan
Department of Radiology, Armed Forces Institute of Radiology and Imaging, Rawalpindi.
Muhammad
M
Nafees
Department of Radiology, Armed Forces Institute of Radiology and Imaging, Rawalpindi.
Attique Ur
AU
Rehman
Department of Ophthalmology, Armed Forces Institute of Ophthalmology, Rawalpindi.
Asad
A
Habib
D000328:Adult; D016022:Case-Control Studies; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009186:Myelin Sheath / Q000473:pathology*; D009900:Optic Nerve / Q000033:anatomy & histology / Q000000981:diagnostic imaging*; D010154:Pakistan; D011559:Pseudotumor Cerebri / Q000000981:diagnostic imaging*; D012680:Sensitivity and Specificity; D014463:Ultrasonography / Q000379:methods; D017585:Ultrasonography, Doppler, Transcranial