Some tumors may not cause symptoms until they are very large.

But a benign tumor can still cause many problems in the brain.

These tumors can cause problems by growing into nearby tissues.

Whether the tumor is causing problems with vision or other symptoms.

However, there are some instances where a benign tumor can cause significant problems, such as in the brain.

Many tumors do not cause symptoms even when they have metastasized.

If a tumor caused it, surgery and other therapies may be needed.

Larger tumors can cause symptoms depending on the size and location.

It is still not clear what causes most Wilms' tumors.

But because these tumors often don't cause any symptoms for many years, early detection can be tricky.