TNFRSF1A and Dilatation of the cerebral artery: Therefore, we hypothesize that due to its relationship with aneurysm formation and the possibility of detecting elevated values of this receptor in peripheral blood, TNFR1 could be used as a blood biomarker to predict the presence of ruptured aneurysms in patients with SAH and for the screening of asymptomatic intracranial aneurysms in patients with suggestive family history.