Cancer is an independent risk factor for ischemic stroke, and stroke can precede tumour diagnosis by many months. A paraneoplastic hypercoagulability has been implicated. Overall, cancer is a rare cause, but should be suspected in cases of cryptogenic stroke. In patients with cryptogenic stroke, two criteria – ischemic lesions in multiple vascular territories and D-dimer values >2,15 µg/ml – predict cancer with 100% specificity according to one relevant study. An adenocarcinoma at an advanced stage is identified in many cases, the risk of stroke-recurrence is high. There is a lack of evidence-based recommendations regarding secondary prevention in these cases. In analogy to the guidelines for venous thromboembolism in cancer patients, low molecular weight heparins might be more efficient compared to other anti-clotting agents.
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