Disorders that cause, or increase the risk for systemic<unk>  thrombosis are associated with central<unk>  thromboses. In children, head and neck infections and acute systemic illnesses are the primary cause of central<unk>  thrombosis.<unk>  is more common in particular situations. 85% of people have at least one of these risk factors: * Thrombophilia, a tendency to develop blood clots due to abnormalities in coagulation, e.g. factor V Leiden, deficiency of protein C, protein S or antithrombin, or related problems * Nephrotic syndrome, a kidney problem causing protein loss in the urine * Chronic inflammatory diseases, such as inflammatory bowel disease, lupus and Behçet's disease * Pregnancy and puerperium (the period after giving birth) * Particular blood disorders, especially polycythemia vera and paroxysmal nocturnal hemoglobinuria * Use of estrogen-containing forms of hormonal contraception * Meningitis and infections of the ear, nose and throat area such as mastoiditis and<unk> itis * Direct injury to the<unk><unk> es * Medical procedures in the head and neck area * Sickle cell anemia * Dehydration, primarily in infants and children * Homocysteinemia * Homocystinuria *COVID-19: Cases of<unk>  have been reported in patients with COVID-19 in the absence of the aforementioned risk factors.
Cerebral venous sinus thrombosis
Subarachnoid hemorrhage
Brain abscess
Cavernous sinus thrombosis
Amoebic brain abscess
Subdural empyema
Arachnoiditis
Pseudosubarachnoid hemorrhage