What it means
The brain makes cerebrospinal fluid (CSF) all the time. It flows through chambers called ventricles and is then absorbed into the blood. Hydrocephalus happens when this flow is blocked or the fluid is not absorbed well, so the ventricles swell with extra fluid. Ventricles that look large only because the brain around them has shrunk are a different thing and not hydrocephalus.
When it matters
How urgent it is depends on the cause and speed. A sudden blockage, for example from a tumor or bleeding, can raise pressure inside the head and needs prompt care. Normal pressure hydrocephalus develops slowly in older adults and can cause walking difficulty, memory changes and bladder control problems. Some types are treated by draining the extra fluid. Doctors compare the scan with older ones and with your symptoms.
Questions to ask your doctor
- Is this true hydrocephalus, or are the ventricles large from volume loss?
- Is anything blocking the flow of fluid?
- Could it explain any walking, memory or bladder symptoms I have?
