Delayed reversal of ONS distension- early post-treatment scan. ONUS performed twenty minutes after first measurement depicted in Figure 4. The ocular globe is the hypoechoic structure in the upper part of the images and the ONS the linear hypoechoic structure behind the globe. Caliper A identifies a point 3 mm behind the retina while Caliper B measures the ONSD. ONSD is 0.53 cm, suggestive of continued intracranial hypertension. Simultaneously recorded ICP from EVD was only 10 mmHg.
Rajajee et al. Critical Care 2012 16:R79 doi:10.1186/CC11336