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''Overview''
    can cause cerebral infarction, much less common than arterial causes
    50% of patients have isolated sagittal sinus thromboses - the remainder have coexistent lateral sinus thromboses and cavernous sinus thromboses

''Features''
    headache (may be sudden onset)
    nausea & vomiting

''Sagittal sinus thrombosis''
    may present with seizures and hemiplegia
    parasagittal biparietal or bifrontal haemorrhagic infarctions are sometimes seen

''Cavernous sinus thrombosis''
    other causes of cavernous sinus syndrome: local infection (e.g. sinusitis), neoplasia, trauma
    periorbital oedema
    ophthalmoplegia: 6th nerve damage typically occurs before 3rd & 4th
    trigeminal nerve involvement may lead to hyperaesthesia of upper face and eye pain
    central retinal vein thrombosis

''Lateral sinus thrombosis''
    6th and 7th cranial nerve palsies