Subdural haemorrhage: acute-on-chronic
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Right subdural haematoma with mixed density - the hyperdense (acute) component is seen inferiorly when the hypodense (chronic) component is seen superiorly.
CT scan through the brain of an elderly patient demonstrates a subdural haemorrhage with acute and chronic components. Note how the acute blood sinks inferiorly (haematocrit effect). A similar appearance can rarely be seen in acute haemorrhage in patients on anticoagulants, where the blood separates into serum and haematocrit rather than clotting.