# Brain tumour diagnosis: MRI and biopsy

> Source: World Aid Network — https://worldaidnetwork.org/cancer/brain-tumour/tests

## 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.

## Key takeaways

- MRI is the key diagnostic scan.
- Tissue type comes from biopsy or surgery.
- Blood tests do not diagnose most primary brain tumours.

## Related pages in this guide

- Overview: https://worldaidnetwork.org/cancer/brain-tumour
- Symptoms: https://worldaidnetwork.org/cancer/brain-tumour/symptoms
- MRI: https://worldaidnetwork.org/cancer/brain-tumour/tests
- Treatment: https://worldaidnetwork.org/cancer/brain-tumour/treatment

## 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.

## How you can help

World Aid Network funds cancer treatment for patients who cannot pay in Pakistan, Indonesia and Malaysia. Donate at https://worldaidnetwork.org/appeal/cancer-emergency or https://worldaidnetwork.org/donate?cause=cancer-treatment&appeal=cancer-emergency

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This is general information, not medical advice, published by World Aid Network. Always consult a qualified clinician about your own health.