Midline Shift
Midline shift is a finding where structures in the brain that normally sit in the middle are pushed to one side, usually because of swelling, bleeding, or a mass.
When to get help quickly: Midline shift is almost always a medical emergency. New neurological symptoms with midline shift on imaging need immediate neurosurgical review.
Common symptoms
Possible symptoms include severe headache, vomiting, drowsiness, confusion, weakness on one side, slurred speech, or reduced consciousness.
When imaging helps
Imaging shows how much the midline has shifted, what is causing it, and whether the brain is herniating into nearby spaces — all critical for surgical planning.
What radiology does
CT of the head is the fastest first test; MRI may follow for more detailed assessment when the picture is clearer.
What usually happens next
Treatment may include steroids, mannitol, or hypertonic saline to reduce brain swelling, surgical evacuation of a bleed, or removal of a mass — depending on the cause.
Seen this on your report?
Your doctor or the radiologist who wrote it can tell you what it means for you.