uk-fficm MCQ (SBA): Traumatic Brain Injury

A 45-year-old woman on ICU has a severe traumatic brain injury with ICP persistently >25 mmHg despite first-tier measures (sedation, osmotherapy, head elevation, CSF drainage). CT shows diffuse oedema with no mass lesion. The neurosurgical team is considering a decompressive craniectomy. Which trial provides the most relevant evidence for this decision?