Perioperative Variation in Optic Nerve Sheath Diameter - A Prospective Observational Study of Traumatic Brain Injury Patients Undergoing Decompressive Craniectomy.

In TBI cases undergoing decompressive craniectomy ONSD is bilaterally increased preoperatively. ONSD reduces significantly immediately after craniectomy; however, the diameters did not near the normal range. There hold a strong correlation between right/left ONSD measurements irrespective of the laterality of injury or side of surgery. Variable elastic properties of ONS in an injured brain can possibly explain our findings.