Diagnostic evaluation of suspected aneurysmal subarachnoid hemorrhage after negative CT: risk-stratified use of lumbar puncture and CT angiography
Aneurysmal subarachnoid hemorrhage (SAH) is a neurologic emergency in which delayed or missed diagnosis can result in substantial morbidity and mortality. In patients who present with clinical features concerning for SAH but have a normal or non-diagnostic non-contrast head computed tomography (CT), the optimal next di...