Sagittal sinuscase 202

Cerebral Venous Thrombosis. Magnetic Resonance Venogram (MRV); (Left) Lateral view; (Right) AP view. Note the absence of the posterior portion of the superior sagittal sinus; the straight sinus, both transverse sinuses and the left sigmoid sinus and internal jugular vein. Only the right sigmoid sinus and internal jugular vein are well seen. Compare this scan to a normal lateral MRV and a normal AP MRV.

Cerebral venous thrombosis (CVT) is an uncommon cause of stroke. As venous outflow is impeded, patients develop venous infarctions which are often hemorrhagic. The etiology of CVT is diverse but most often includes the following:

● Genetic hypercoagulable states (e.g., protein S and C deficiencies, antithrombin III deficiency, Leiden factor V mutation)
● Oral contraceptives
● Pregnancy / puerperium
● Collagen vascular diseases (especially Systemic Lupus Erythematosus)
● Antiphospholipid antibody syndrome
● Malignancy
● Adjacent infectious processes (e.g., otitis, mastoiditis, sinusitis)

Patients typically present with a prominent headache. In addition, thrombosis of the superior sagittal sinus classically presents with bilateral leg weakness, as the superior sagittal sinus is midline. Depending on what other sinuses are thrombosed, there can be a multitude of other focal neurological deficits. Seizures are not uncommon. In addition, blockage of venous outflow commonly results in intracranial hypertension. Papilledema may be seen. CVT can mimic the syndrome of idiopathic increased intracranial pressure (so-called pseudotumor cerebri). CVT is an important diagnosis to recognize, as anticoagulation is indicated to prevent further clot formation. The prognosis of CVT varies, from complete recovery, to residual neurological deficits, to death.

Cerebral Venous Thrombosis - Case 2