Read the article: The formation of cerebral venous thrombosis

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2.

3, the trap

• Major dural sinuses:

  
  

• Cortical veins:

• The vein of Labbe, drains the temporal lobe

  
  

• The vein of Trolard, the largest cortical vein, drains into the superior sagittal sinus

  
  

• Deep veins:

  
  

• cavernous sinus

Major dural sinuses:

Cortical veins:

• The vein of Labbe, drains the temporal lobe
  .
  

• The vein of Trolard, the largest cortical vein, drains into the superior sagittal sinus
  .
  

The vein of Labbe, drains the temporal lobe
.

The vein of Trolard, the largest cortical vein, drains into the superior sagittal sinus
.

Deep veins:
Internal cerebral veins and thalamostriated veins
.

cavernous sinus

Clinically, patients with cerebral venous thrombosis have various symptoms, ranging from headache to epilepsy and severe coma
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In neonates, shock and dehydration are common causes of venous thrombosis
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In older children, it is usually a localized infection such as mastoiditis or coagulation disorders
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In adults, coagulation disorders are the cause in 70% of cases and infections in 10% of cases
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Among women, oral contraceptive use and pregnancy are serious risk factors
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• Direct signs of thrombosis
• Non-arterial infarcts, especially bilateral and hemorrhagic infarcts
• Cortical or peripheral lobe hemorrhage
• cortical edema

A thrombus in a cerebral vein directly displayed on a non-enhanced CT scan is called the sign of density
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This occurs in only one-third of cases
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Normally, veins are slightly denser than brain tissue, and in some cases it is difficult to tell whether the veins are normal or overdense (see pitfalls)
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In this case, enhanced scanning is required to resolve the issue
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The following figure shows the triangle of denseness
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MR Vascular Empty Disappearance

Bottom is a T2-weighted image with normal blood flow in the right sigmoid sinus and jugular vein (blue arrows)
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There is abnormal hyperintensity on the left, which is the result of thrombosis (red arrow)
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venous infarction

CTV

Magnetic Resonance Venography MRV

DSA