Acute on chronic subdural haematoma causing mass effect
Headache, disorientation followed by altered level of consciousness.
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Supratentorial crescent-shaped hypodense extra-axial collection with hyperdense area in the dependent portion and few internal septations involving the left fronto-temporo-parietal region. This causes mass effect by displacing the underlying brain parenchyma medially and effacing the adjacent cortical sulci, sylvian fissure and left lateral ventricle with contralateral midline shift.
The patient underwent surgical drainage with the evacuation of the chronic subdural hematoma with resection of its encapsulating membrane.
Rehemorrhage, either from vascularized encapsulating membrane or rupture of stretched cortical veins crossing the expanded subdural space result in “acute on chronic” subdural hematomas.