New CT measurements to assess decompression after hemicraniectomy: A two-center reliability study.

•With large hemispheric infarctions, swelling leads to midline brain herniation.•Midline brain herniation causes additional serious brain injuries.•Hemicraniectomy decompresses brain swelling and limits additional brain injuries.•Surgical and other factors can influence the effectiveness of brain decompression.•CT measurements could assess the effectiveness of brain decompression.