Abstract
Intracranial sinus thrombosis (ICST) and subarachnoid haemorrhage (SAH) are common presentations to neuroscience departments, which may indicate potentially life-threatening neurological conditions, however the two disorders require completely different treatment. Non-thrombotic SAH is most frequently the result of ruptured berry aneurysm and often presents with a sudden onset of severe headache. ICST may uncommonly present with thunderclap headache, that is, sudden onset severe headache, thereby mimicking SAH. The classic computed tomography (CT) appearances of SAH and ICST are different and not usually a source of diagnostic mistakes. However, errors can occur and in this paper, we present three cases of ICST that were misdiagnosed as SAH on the clinical presentation and on the initial CT brain examinations.
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