title: Subarachnoid hemorrhage in ten questions.
abstract: Traumatic subarachnoid hemorrhage (SAH) has an annual incidence of 9 per 100 000 people. It is a rare but serious event, with an estimated mortality rate of 40% within the first 48hours. In 85% of cases, it is due to rupture of an intracranial aneurysm. In the early phase, during the first 24hours, cerebral CT, combined with intracranial CT angiography is recommended to make a positive diagnosis of SAH, to identify the cause and to investigate for an intracranial aneurysm. Cerebral MRI may be proposed if the patient's clinical condition allows it. FLAIR imaging is more sensitive than CT to demonstrate a subarachnoid hemorrhage and offers greater degrees of sensitivity for the diagnosis of restricted subarachnoid hemorrhage in cortical sulcus. A lumbar puncture should be performed if these investigations are normal while clinical suspicion is high.
authors.affiliation: Inserm UMR 894, Department of Neuroradiolgy, Faculty of Medicine Paris Descartes University, Pyschiatry and Neurosciences Centers, Sainte-Anne Hospital, Sorbonne Paris Cité, 1, rue Cabanis, 75014 Paris, France; Department of Neuroradiology, Lille Nord de France University, Roger Salengro Hospital, Lille University Hospitals, avenue Émile-Laine, 59037 Lille cedex, France. Electronic address: myriam.edjlali@gmail.com.
authors.forename: M
authors.initials: M
authors.lastname: Edjlali
authors.affiliation: Inserm UMR 894, Department of Neuroradiolgy, Faculty of Medicine Paris Descartes University, Pyschiatry and Neurosciences Centers, Sainte-Anne Hospital, Sorbonne Paris Cité, 1, rue Cabanis, 75014 Paris, France.
authors.forename: C
authors.initials: C
authors.lastname: Rodriguez-Régent
authors.affiliation: Department of Neuroradiology, Lille Nord de France University, Roger Salengro Hospital, Lille University Hospitals, avenue Émile-Laine, 59037 Lille cedex, France.
authors.forename: J
authors.initials: J
authors.lastname: Hodel
authors.affiliation: Department of Neurosurgery, Lille Nord de France University, Roger Salengro Hospital, Lille University Hospitals, avenue Émile-Laine, 59037 Lille cedex, France.
authors.forename: R
authors.initials: R
authors.lastname: Aboukais
authors.affiliation: Inserm UMR 894, Department of Neuroradiolgy, Faculty of Medicine Paris Descartes University, Pyschiatry and Neurosciences Centers, Sainte-Anne Hospital, Sorbonne Paris Cité, 1, rue Cabanis, 75014 Paris, France.
authors.forename: D
authors.initials: D
authors.lastname: Trystram
authors.affiliation: Department of Neuroradiology, Lille Nord de France University, Roger Salengro Hospital, Lille University Hospitals, avenue Émile-Laine, 59037 Lille cedex, France.
authors.forename: J-P
authors.initials: JP
authors.lastname: Pruvo
authors.affiliation: Inserm UMR 894, Department of Neuroradiolgy, Faculty of Medicine Paris Descartes University, Pyschiatry and Neurosciences Centers, Sainte-Anne Hospital, Sorbonne Paris Cité, 1, rue Cabanis, 75014 Paris, France.
authors.forename: J-F
authors.initials: JF
authors.lastname: Meder
authors.affiliation: Inserm UMR 894, Department of Neuroradiolgy, Faculty of Medicine Paris Descartes University, Pyschiatry and Neurosciences Centers, Sainte-Anne Hospital, Sorbonne Paris Cité, 1, rue Cabanis, 75014 Paris, France.
authors.forename: C
authors.initials: C
authors.lastname: Oppenheim
authors.affiliation: Department of Neurosurgery, Lille Nord de France University, Roger Salengro Hospital, Lille University Hospitals, avenue Émile-Laine, 59037 Lille cedex, France.
authors.forename: J-P
authors.initials: JP
authors.lastname: Lejeune
authors.affiliation: Department of Neuroradiology, Lille Nord de France University, Roger Salengro Hospital, Lille University Hospitals, avenue Émile-Laine, 59037 Lille cedex, France.
authors.forename: X
authors.initials: X
authors.lastname: Leclerc
authors.affiliation: Inserm UMR 894, Department of Neuroradiolgy, Faculty of Medicine Paris Descartes University, Pyschiatry and Neurosciences Centers, Sainte-Anne Hospital, Sorbonne Paris Cité, 1, rue Cabanis, 75014 Paris, France.
authors.forename: O
authors.initials: O
authors.lastname: Naggara
mesh_terms: D017542:Aneurysm, Ruptured / Q000175:diagnosis* / Q000401:mortality; D016477:Artifacts; D002533:Cerebral Angiography; D003287:Contrast Media; D003937:Diagnosis, Differential; D004630:Emergencies; D006801:Humans; D006849:Hydrocephalus / Q000175:diagnosis / Q000401:mortality; D007089:Image Enhancement; D018810:Magnetic Resonance Angiography; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D009460:Neurologic Examination; D012680:Sensitivity and Specificity; D013129:Spinal Puncture; D013345:Subarachnoid Hemorrhage / Q000175:diagnosis* / Q000401:mortality; D020206:Subarachnoid Hemorrhage, Traumatic / Q000175:diagnosis* / Q000401:mortality; D014057:Tomography, X-Ray Computed
chemical_list: D003287:Contrast Media
keywords: CT; Hemorrhage; Intracranial aneurysm; MRI