title: An unusual variant in cerebral circulation studies.
mesh_terms: D001932:Brain Neoplasms / Q000175:diagnosis*; D002561:Cerebrovascular Disorders / Q000175:diagnosis*; D005260:Female; D006801:Humans; D007275:Injections, Intravenous; D008875:Middle Aged; D011877:Radionuclide Imaging; D012018:Reflex; D012119:Respiration; D013667:Technetium / Q000008:administration & dosage; D014636:Valsalva Maneuver
chemical_list: D013667:Technetium