title: Optic nerve sonography in the diagnostic evaluation of pseudopapilledema and raised intracranial pressure: a cross-sectional study.
abstract: Introduction. Differentiating pseudopapilledema from papilledema which is optic disk edema and a result of increased ICP (intracranial pressure) is important and can be done with noninvasive methods like orbital ultrasound examination. Method. This was a cross-sectional study in which patients with optic nerve head swelling were referred for LP exam after optic nerve head swelling diagnosis confirmation and having normal brain imaging (CT scan). Before LP (lumbar puncture) exam the patients were referred for optic nerve ultrasound test of both eyes. Results. Considering 5.7 mm as the upper limit for normal ONSD (optic nerve sheath diameter), sensitivity and negative predictive value of optic sonography in diagnosis of pseudopapilledema are 100% for both eyes. Calculated accuracy validity of ONSD measurement in detecting pseudopapilledema is 90% for the right eye and 87% for the left eye. Conclusion. Our study demonstrated a close correlation between optic nerve sheath dilation on ocular ultrasound and evidence of elevated ICP with optic disk swelling. With the aid of noninvasive diagnostic tests we can avoid unnecessary concerns along with expensive and invasive neurological investigations while targeting the correct diagnosis in bilateral optic disk swelling. Our study showed optic nerve sonography as a reliable diagnostic method for further usage.
authors: Department of Neurology and Stroke Center, Firoozgar General Hospital, Iran University of Medical Sciences, Tehran 1449614535, Iran.
authors: Masoud
authors: M
authors: Mehrpour
authors: Iran University of Medical Sciences, Tehran 1449614535, Iran.
authors: Fatemeh
authors: F
authors: Oliaee Torshizi
authors: Students' Scientific Research Center (SSRC), Tehran University of Medical Sciences, Tehran 1417755331, Iran.
authors: Shooka
authors: S
authors: Esmaeeli
authors: Iran University of Medical Sciences, Tehran 1449614535, Iran.
authors: Salameh
authors: S
authors: Taghipour
authors: Iran University of Medical Sciences, Tehran 1449614535, Iran.
authors: Sahar
authors: S
authors: Abdollahi