Decompressive craniectomy done in a patient that suffered a traumatic brain injury! This is an emergency neurosurgical procedure that is performed on victims of severe traumatic brain injury or middle cerebral artery territory infarction (stroke) and is aimed to to relieve the increased intracranial pressure and brain tissue shifts that occur in the setting of large cerebral hemisphere mass or space-occupying lesions. In general, the technique involves removal of bone tissue (skull) and incision of the restrictive dura mater covering the brain, allowing swollen brain tissue to herniate upwards through the surgical defect rather than downwards to compress the brainstem due to a mass effect with the accompanied increased intracranial pressure.