This study is about helping people with brain and nerve conditions. It includes people aged 4 and older who may have conditions like brain tumors, epilepsy, or Parkinson's disease. Participants will get regular medical evaluations and treatments that might include lab tests and scans to help doctors understand their condition better. Some people might have surgery or other medical treatments if required. The study is mainly observing and collecting data, meaning it doesn't test new treatments. This data could help future research. Sometimes, doctors might do extra tests to see if the condition is genetic (passed down in families). If participants agree, they might give extra samples like skin or saliva for research.

• Participants won't receive new treatments, just regular care.
• Data and samples from care may be used for future research.
• No extra visits are needed beyond normal medical care.