Hypodense dural venous sinuses due to anaemia
Persistent headache. Has lymphoma and is on chemotherapy and severely anaemic.
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The dural venous sinuses appear markedly hypodense, which is in keeping with anaemia. Otherwise normal study with the dural venous sinuses opacifying normally on CTV.
The patient's haemoglobin was only 60. CT is not a very accurate or efficient way of measuring hematocrit but nonetheless it can be detected.