The benefit of decompressive craniectomy for the treatment of uncontrolled post-traumatic intracranial hypertension seems to be encouraging if medical management fails. We present our experience in 22 cases of cerebral edema due to head trauma. The edema alone was rarely the direct consequence of head trauma. Frequently it was associated with an acute subdural or extradural hematoma and contusion (with or without mass effect). First of all we treated the mass effect of the hematoma and contusion when the diameter was more than 3 cm. Intracranial pressure was monitored in the majority of patients. Bone decompression was performed in the operating theatre depending on the values of intracranial pressure. In our series 41% of patients had a good recovery, 18% a severe disability, 23% a vegetative state and 18% died. The findings showed that the bony decompression must be performed early before the situation becomes irreversible. We suggest that if intracranial pressure values remain greater than 30 mmHg with cerebral perfusion pressure below 70 mmHg, despite vigorous anti-edema therapy, decompressive craniectomy should be considered.