The EVD catheter is most frequently placed by way of a twist-drill craniostomy placed at Kocher's point, a location in the frontal bone of the skull, with the goal of placing the catheter tip in the frontal horn of the lateral ventricle or in the third ventricle.[2][3] The catheter is typically inserted on the right side of the brain, but in some cases a left-sided approach is used, and in other situations catheters are needed on both sides.[3] EVDs can be used to monitor intracranial pressure in patients with traumatic brain injury (TBI),[4] subarachnoid hemorrhage (SAH),[5] intracerebral hemorrhage (ICH), or other brain abnormalities that lead to increased CSF build-up. In draining the ventricle, the EVD can also remove blood products from the ventricular spaces. This is important because blood is an irritant to brain tissue and can cause complications such as vasospasm.