**Study Summary:** This study looks at diseases that affect the brain, called *cognitive neurodegenerative diseases*. These diseases can be hard to diagnose correctly, but using special tests called *biomarkers* can help. Biomarkers are like clues in the body that doctors can check to see if someone has a specific disease. For diseases like Alzheimer's, doctors look for biomarkers in a liquid around the brain and spine called *cerebrospinal fluid* (CSF). This study aims to see if Alzheimer's biomarkers also change with other brain diseases and find new biomarkers for different diseases. **Key Points:** - You need to have a procedure called a *lumbar puncture* (LP) to take part. This involves collecting CSF from your lower back. - You must have a clear diagnosis from your doctor to join. - This study does not include payments or involve any treatments. It's about helping doctors better diagnose diseases in the future. **HTML Tags for Web:**

Study Summary:

This study looks at diseases that affect the brain, called cognitive neurodegenerative diseases. These diseases can be hard to diagnose correctly, but using special tests called biomarkers can help. Biomarkers are like clues in the body that doctors can check to see if someone has a specific disease. For diseases like Alzheimer's, doctors look for biomarkers in a liquid around the brain and spine called cerebrospinal fluid (CSF). This study aims to see if Alzheimer's biomarkers also change with other brain diseases and find new biomarkers for different diseases.

Key Points:

• You need to have a procedure called a lumbar puncture (LP) to take part. This involves collecting CSF from your lower back.
• You must have a clear diagnosis from your doctor to join.
• This study does not include payments or involve any treatments. It's about helping doctors better diagnose diseases in the future.