Retrospective Study
Copyright ©The Author(s) 2017.
World J Methodol. Sep 26, 2017; 7(3): 108-111
Published online Sep 26, 2017. doi: 10.5662/wjm.v7.i3.108
Figure 1
Figure 1 B scan ultrasound picture showing the normal round hypoechoic area of optic nerve (white arrow) with a hypoechoic crescent shaped area (red arrow) depicting “crescent” or “doughnut” sign.