Immuno-inflammation in the Acute Phase of an Ischaemic Cerebral Accident Managed by Decompressive Hemicraniectomy: a Case-control Study

Inclusion Criteria Patients: * Collegial indication given by a neurologist, a neuroreanimator and a neurosurgeon for HD in the context of a malignant sylvian AIC. Inclusion Criteria Control: \- For neurosurgical operations in which cranial, meningeal, vascular (branch of the middle meningeal artery) or cerebral bone tissue is not preserved during the surgical approach. Non-inclusion Criteria Patients: * HD carried out in a context of acute cerebral haemorrhage * Pre-existing neurological disability: modified Rankin score \> 2 * Patient benefiting from a legal protection measure Non-inclusion Criteria Controls: * Patient to be operated on for an acute vascular condition: meningeal haemorrhage, subdural or extradural haemorrhage, intra parenchymal haemorrhage. * Patient operated on for an osteomeningeal pathology present at the approach site. * Patient operated on for an infectious cranial or neuro-meningeal pathology. * Patient to be operated on as a result of an intracranial traumatic condition