In pediatric cerebral venous sinus thrombosis, which imaging modality confirms the diagnosis, and what is a key treatment consideration if there is no contraindicating hemorrhage?

• A. Ultrasound of the head; antibiotics
• B. MRV (magnetic resonance venography) or CT venography; anticoagulation is often used if no contraindicating hemorrhage
• C. EEG; antiepileptic therapy only
• D. Plain skull X-ray; surgery is always required

Answer: (B)

In this scenario, the key idea is that confirming cerebral venous sinus thrombosis relies on imaging that directly visualizes the venous system. MR venography or CT venography provides a clear view of the cerebral sinuses and will show a filling defect or absence of flow where the clot is located, making them the best tests to confirm pediatric CVST. MRI can reveal any associated brain tissue changes, but the decisive finding is the thrombosis seen on venography.

Once a pediatric CVST is confirmed and there isn't a hemorrhage that would contraindicate anticoagulation, the main treatment is anticoagulation to prevent clot propagation and promote recanalization. In children, that typically means using low molecular weight heparin or unfractionated heparin, with a plan to transition to longer-term oral anticoagulation as appropriate. This approach is favored because the benefit of stopping the clot from growing and helping it reopen generally outweighs the bleeding risk when there is no contraindicating hemorrhage.

Other imaging methods like ultrasound of the head don’t reliably diagnose CVST, EEG isn’t used to confirm the thrombosis, and plain skull X-ray won’t show the venous thrombosis. Surgery isn’t routinely required unless complications arise or medical therapy fails.