Table 1.

Risk Factors for Cerebral Venous Thrombosis (CVT)

Infection	Paranasal sinusitis Intracranial infection: abscess, meningitis
Trauma	Head trauma Neurosurgical interventions Internal jugular catheter
Medical/surgical conditions	Dehydration Pregnancy and puerperium Coagulation disorders: Factor V Leiden (Activated protein C                      resistance), Protein C deficiency, Protein S deficiency,                      Antithrombin III deficiency, Hyperhomocysteinemia,                      Antiphospholipid syndrome Hematologic disorders: Polycythemia, Sickle cell disease,                      Thrombotic thrombocytopenic purpura, Polycythemia,                      Paroxysmal nocturnal hemoglobinuria Malignancies, Inflammatory bowel disease, Nephrotic syndrome, Dehydration, Liver cirrhosis, Collagen vascular diseases including Systemic lupus erythematosus, Wegener's granulomatosis and Behcet syndrome Previous surgical procedures
Medication	Oral contraceptives, hormone replacement therapy, L-asparagenase, epsilon aminocaproic acid, Corticosteroid