Chronic subdural haematoma
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The native CT images show a crecsent shaped, isodense strap of hematoma along the brain parenchyma bilaterally.
Pneumocephalus is seen on the lower set of images taken after the decompressive craniotomy has been performed.
The patient was suffering from a headache, that started a few weeks ago, without any other neurological symptoms.
A subacute subdural hematoma is between 3 to 7 days old and is usually isodense to brain parenchyma. A chronic subdural haemtoma is more than one week old, and is usually hypodense to brain parenchyma.
Cerenbral atrophy can increase the length of bridging veins, increasing the risk for the development of SDH, even after a minor trauma.