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  1. Vivek Mundada1,
  2. Deepa Krishnakumar1,
  3. Manali Chitre1,
  4. Tilak Das2
  1. 1Department of Paediatric Neurology, Addenbrooke's Hospital, Cambridge, UK
  2. 2Department of Radiology, Addenbrooke's Hospital, Cambridge, UK
  1. Correspondence to Dr Vivek Mundada, Department of Paediatric Neurology, Addenbrookes Hospital, Cambridge CB2 0QQ, UK; v.mundada{at}nhs.net

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Question 1: C

Unenhanced CT examination of the brain revealed extensive thrombosis in the superior sagittal, straight and left transverse sinuses (figure 1). The CT angiogram (figure 2) confirmed venous thrombosis and an arterial infarct. It revealed complete occlusion of left internal carotid artery and segmental vasculopathy, affecting multiple intracranial and extracranial vessels of both the anterior and posterior circulation along with an aneurysmal ascending aorta. The contrast-enhanced CT scan demonstrated a filling defect of the superior sagittal sinus with minimal peripheral contrast enhancement, known as the ‘empty delta sign’.1 It is a useful radiological …

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