ICAM1 and Hydrocephalus: To determine the biomarker potential of vascular injury proteins in the tissue fluids of patients with aSAH, we evaluated the levels of vascular injury proteins, CRP, VCAM-1, ICAM-1, and SAA in the CSF of patients with aSAH and compared them to CSF samples from patients with hydrocephalus, which were used as non-aSAH controls.