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An 18-year-old man presented with a 1-month history of global headache with lassitude and dyspnoea on exertion. Clinical examination was unremarkable except for pallor and tachycardia. An unenhanced CT of the cranium showed marked hypodensity in the region of the superior sagittal and transverse venous sinuses (figure 1A). The ambient cistern appeared to be effaced on CT. In view of the headache and hypoattenuating venous sinuses on CT, the possibility of thrombosis of …
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