For some low-grade gliomas, the recommended plan after diagnosis (or after surgery) is to watch and wait — also called active surveillance or observation. For many patients, this feels deeply counterintuitive: there's a tumor in my brain, and we're not treating it? Understanding the reasoning can ease that distress.
Why monitor instead of treat? Treatments like radiation and chemotherapy have real long-term costs, including effects on memory and thinking. For a slow-growing tumor that's stable and not causing problems, the risks of treatment may outweigh the benefits at that moment. The goal is to intervene at the right time — when the tumor shows signs of growth or starts causing symptoms — rather than reflexively at the earliest possible point. This is a deliberate, evidence-based strategy, not neglect.
When is watch-and-wait considered? It depends on factors such as the tumor's grade, molecular markers, size, location, symptoms, your age, and how much was removed at surgery. It's most relevant for certain stable, lower-risk low-grade tumors. (Newer options like vorasidenib are also changing some of these conversations for IDH-mutant tumors.)
What active surveillance involves "Watching" is active, not passive. It typically means:
- Regular MRI scans (for example, every few months at first, then spaced out if stable) to detect any change early
- Clinical check-ins to monitor symptoms, seizures, and neurological function
- A clear plan for what triggers treatment — growth on imaging, new or worsening symptoms, or changing features
Living with it The hardest part of watch-and-wait is often psychological — living with a known tumor and recurring "scan anxiety." This is completely normal, and it's worth naming to your team. Some people find it helpful to focus on what they can control (follow-up, healthy habits, mental health support) and to remember that close monitoring means any change should be caught early, when options remain.
If observation is recommended for you, ask: Why is watching the better choice for me now? How often will I be scanned? What specific changes would prompt treatment? Clear answers make the uncertainty more bearable.