ObjectiveTo investigate the role of TGF-β1 in the development of chronic hydrocephalus after aneurysmal subarachnoid hemorrhage(aSAH), and the potential risk factors related to it. MethodsThe clinical data of 115 consecutive a SAH patients with acute hydrocephalus treated in our center from May 2014 to November 2016 were prospectively analyzed. 106 patients received extraventricular drainage as part of the treatment for acute hydrocephalus. Followed up c losely for three months, 35 patients developed chroni...