In short
MRI of the head is the main test when a brain tumour is possible. CT is sometimes used first in an emergency. A biopsy or the operation itself obtains tissue so a pathologist can name the tumour. Blood tests do not diagnose most primary brain tumours. This is general information. Urgent symptoms need 999 or A&E, not a webpage.
Imaging shows where a mass is. Tissue type decides treatment. Some tumours are diagnosed only after surgery.
MRI or CT first?
A&E often starts with CT because it is fast. MRI gives more detail for planning. Contrast dye may be used unless it is unsafe.
When is a biopsy done?
If the tumour cannot be fully removed, or the type is unclear on scans, a stereotactic biopsy samples tissue. Risks and benefits are explained by the neurosurgeon.
What about lumbar puncture?
It is not the first test for a solid brain mass. It is used in some cancers that involve the spinal fluid. Your team will say if it is needed.
What are the key takeaways?
- MRI is the key diagnostic scan.
- Tissue type comes from biopsy or surgery.
- Blood tests do not diagnose most primary brain tumours.
Care like this is out of reach for millions
The diagnosis, screening and treatment described here are routine in the UK. In Pakistan, Indonesia and Malaysia, poverty puts them out of reach — so a treatable cancer too often becomes a fatal one. World Aid Network funds treatment through locally-licensed oncologists for patients who cannot pay.
Frequently asked questions
Can I have MRI with metal implants?
Some implants are MRI-conditional. Radiology checks this before the scan.
Does a clear CT rule a tumour out?
Not always. MRI is more sensitive. Specialists decide if another scan is needed.
Does WAN offer UK MRI?
No. We fund overseas treatment access.
This guide is general information, not medical advice. It was reviewed by the World Aid Network editorial team for accuracy against NHS and World Health Organization sources. Always speak to a GP or qualified clinician about your own health.