Idiopathic intracranial hypertension (IIH) is characterized by elevated intracranial pressure and is associated with dural venous sinus stenoses. Restoration of venous blood flow by venous stenting significantly improves brain fluid dynamics, yet the mechanisms linking venous outflow alterations to intracranial pressure elevation remain unresolved. Meningeal lymphatic vessels (MLVs) have recently been identified as regulators of brain fluid clearance, but the determinants of their maintenance and function in neurological disorders remain poorly defined.
This lecture will present human and experimental evidence demonstrating that cerebral venous blood flow is required for MLV integrity and function. In IIH patients, venous sinus stenoses are associated with altered perivenous fluid distribution and brain edema. In mouse models combining venous outflow obstruction and targeted MLV depletion, impaired venous flow leads to MLV dysfunction, resulting in
defective brain clearance and intracerebral hypertension.
Together, these findings establish venous blood flow as an upstream regulator of meningeal lymphatic function and identify the dural venous sinuses as central
regulators of brain fluid and intracerebral pressure homeostasis.
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