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D-dimer in Cavernous sinus Thrombosis

Three Part Question

In [patients presenting to ED with Acute Headaches] does [ Negative D-dimer] rule out [cavernous Sinus Thrombosis]

Clinical Scenario

60 Lady presents with headaches < 72 hours in duration and vague neurological signs. you are not sure what the diagnosis might be and think of cavernous Sinus thrombosis . You get a CT head which is normal . You think if a D-dimer levels were low could you exlude Cavernous sinus thrombosis a dangerous cause of Headaches.