Background and Purpose: Deficiencies in coagulant inhibitors protein C, protein S, and antithrombin III increase the risk of venous thrombosis. We describe 10 young adults with cerebral arterial thrombosis due to deficiencies in these factors.Methods: Sixty patients younger than 45 years were hospitalized because of acute ischemic stroke diagnosed through computed tomography or magnetic resonance imaging. Cerebral angiography was performed in 54 cases. Hematologic and coagulation profiles, autoantibody screen, syphilis serology, and lupus anticoagulant were analyzed in all patients. Among the total cases, Holter monitoring was performed in 13 patients, echocardiography in 20, and cerebrospinal fluid studies for cysticercosis and

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