[Intracerebral hemorrhage immediately following the operation of chronic subdural hematoma]

Complications following the operations for chronic subdural hematoma include recurrence of the hematoma, infection, seizure, and failure of the brain to expand due to cerebro-cranial disproportion. This report presents cases with intracerebral hemorrhage which is relatively rare complication. In case 1, a 35-year-old man developed status epilepticus immediately after the operation for chronic subdural hematoma. An emergency CT scan revealed acute brain swelling, and still, after the external decompressive craniotomy, CT scan showed severe brain swelling with subcortical diapedetic hemorrhage. In case 2, a 78-year-old woman whose CT scan had shown bilateral CSH and brain herniation, demonstrated intracerebral hemorrhage in the medial occipital lobe when examined post-operatively by CT scan. It is possible that the mechanisms of intracerebral bleeding following the operation for CSH are 1) diapedesis through increased permeability of parenchymal blood vessels due to the sudden increase in cerebral blood flow following the existence of longstanding extracerebral mass, and 2) hemorrhagic infarction due to recanalization of posterior cerebral artery compressed by the herniating medial temporal lobe. We should therefore avoid sudden decompression in the management of the cases which showed pre-operative consciousness disturbance or abnormal low or high density on CT scan, because these findings may be preoperative indications of brain fragility.