What should you know about magnetic resonance imaging of the brain?

The scan can help clinicians examine areas that may be difficult to assess from symptoms alone. Depending on the reason for referral, it may show changes in brain tissue, swelling, bleeding, blood-vessel problems, or a mass such as a brain tumour. It can also help describe the position and appearance of an abnormal area and support planning for further tests.

An MRI does not by itself prove that a finding is cancer. A radiologist interprets the images alongside your history and examination. If tissue identification is needed, a biopsy may be discussed. An MRI scanner is a large machine with a central opening; it makes loud sounds while images are collected.

Tell the imaging team about metal in your body, implanted devices, kidney problems, allergies, pregnancy, or difficulty staying in enclosed spaces. Remove jewellery, watches, cards, and other metal items as instructed. Some scans use contrast through a vein to make particular tissues easier to distinguish; the team will explain whether this is planned.

During the scan, you lie still on a sliding table. The team can hear and speak with you, and you may receive ear protection. Movement can blur the pictures, so follow the breathing and positioning instructions. Ask when and how the report will reach the clinician who requested the scan.

Seek emergency help for a sudden, severe headache, new weakness or numbness on one side, trouble speaking, a seizure, sudden confusion, or sudden loss of vision. These symptoms need prompt assessment regardless of whether an MRI has already been arranged. After contrast, get urgent help for breathing difficulty, facial swelling, or a rapidly spreading rash.

What question is this MRI intended to answer? Will contrast be used, and do my medicines or implants affect the plan? When should I expect the report, and what finding would lead to another test?