“…All CVT patients who fulfilled the screening criteria were included in the final analysis, whether or not with clear etiologies. Referring to literatures about the CVT etiologies, 2 , 12 , 13 , 14 well‐established risk factors of CVT in this study mainly covered with overweight (body mass index, BMI > 25.0 kg/m 2 ), obstetric causes (pregnancy or postpartum), oral contraceptive use, hemopathy (i.e., anemia, thrombocythemia or polycythemia vera), protein C/S deficiency, nephrotic syndrome, connective tissue disease (i.e., antiphospholipid syndrome, APS and systemic lupus erythematosus, SLE), hyperhomocysteinemia (>20.0 mmol/L), and infection (i.e., mastoiditis, periodontal abscess, etc.) as well as other causes (such as diarrhea, therapy with cyclosporine A, malignancy, ovarian hyperstimulation syndrome, hormonal therapy, etc.).…”