severe neuroforaminal stenosisbilateral neuroforaminal stenosislumbar neuroforaminal stenosiscardiovascular stenosisurethral stenosis treatmenttracheal stenosishow to diagnose aortic stenosisassessment of aortic stenosisaortic stenosis guidelinesmedicine for aortic stenosisaortic stenosis and exercisemedical treatment for aortic stenosis