ObjectiveTo assess the safety and efficacy of stent thrombectomy alone or combined with intermediate catheter aspiration for severe cerebral venous sinus thrombosis.MethodWe retrospectively collected the clinical data of 7 patients with severe CVST who received endovascular treatment at our hospital from January 2017 to June 2020. The patients had at least one adverse prognostic factor (mental status disorder, comatose state, intracerebral hemorrhage, or thrombosis of the deep venous system).ResultsThe median age was 51 years. Three patients were women. Two or more venous sinuses were in involved in 5 patients. All patients received systemic anticoagulant therapy before endovascular therapy. Neurological deterioration was the main reason for patients with cerebral venous sinus thrombosis undergoing intravascular therapy. The median time from admission to intravascular therapy was 3 days (1–9 days). Primary endpoints: 6 patients (85.7%) had a modified Rankin scale score of 0 at day 90, and 1 patient (14.3%) had a modified Rankin scale score of 2 at day 90. Secondary endpoints: complete recanalization was achieved in 4 cases (57.1%) and partial recanalization in 3 cases (42.9%).ConclusionStent thrombectomy, combined with intermediate catheter aspiration, balloon dilation, and regional thrombolysis/anticoagulation treatment, is an effective strategy to treat severe cerebral venous sinus thrombosis patients who had inadequate response to anticoagulant therapy. This strategy can quickly eliminate the occluded venous sinus and improve prognosis of severe cerebral venous sinus thrombosis.

Rationale: Cerebral venous sinus thrombosis associated with protein S deficiency is rare in adolescent patients and has high disability and fatality. Patient concerns: A 15-year-old male student presented in the hospital with sudden headache, nausea, and vomiting and was diagnosed with protein S deficiency by gene testing. Diagnoses: Cerebral venous sinus thrombosis due to protein S deficiency was diagnosed in this adolescent patient, who underwent successful endovascular therapy (EVT). Interventions: The patient was treated with standard anti-coagulation therapy including low-molecular-weight heparin (90 IU/kg/Q12 h) and dehydrant (mannitol 125 mL Q8 h); however, the symptoms were not alleviated. Successful EVT was implemented. Outcomes: Both the superior sagittal sinus and bilateral transverse sinus were recanalized after thrombus clearance. The patient achieved a complete recovery without any other stroke recurrence during follow-up. Lessons: EVT can be performed with favorable and effective clinical outcomes in adolescent cerebral venous sinus thrombosis patients with protein S deficiency. EVT associated with standard anti-coagulation therapy may improve the prognosis and reduce mortality among such patients.