Radiotherapy for a brain AVM

This treatment is often called stereotactic radiosurgery even though it does not involve a surgical cut. Suitability depends on the AVM’s size, shape and location, previous bleeding, symptoms, blood-vessel anatomy and the risks of surgery or catheter-based treatment.

An AVM is a tangle of abnormal vessels where blood passes directly from arteries to veins. Carefully aimed radiation injures the vessel lining, prompting thickening and gradual closure. The AVM may continue to carry a bleeding risk while this process takes place.

Planning combines detailed brain imaging with a head frame or fitted mask to keep the target aligned. The team shapes beams around the AVM while limiting exposure to nearby brain tissue. Larger or complex AVMs may require a staged plan or a different treatment approach.

Tell the neurovascular team about seizures, headaches, previous bleeding, pregnancy, implanted devices, allergies and all medicines, especially blood-thinning or anti-seizure medicines. Follow the centre’s instructions about eating, medicines and transport on treatment day.

Attend planned imaging because symptoms alone cannot show whether the vessels have closed. Continue prescribed seizure medicine and activity precautions until the treating specialist changes them. Report new neurological symptoms during the interval between treatment and confirmed closure.

Call emergency services for a sudden severe headache, seizure, collapse, new weakness or numbness, difficulty speaking, confusion, loss of balance, vision loss or repeated vomiting. These symptoms may signal bleeding or swelling and need urgent brain imaging.

Contact the treatment team promptly for a persistent worsening headache, new milder neurological change, increasing drowsiness or problems at a frame-pin site. Do not drive yourself if symptoms affect awareness, movement or vision.

Ask what the scans show about the AVM’s location and drainage, why radiation is preferred, whether treatment will be delivered in one session or stages, what short-term swelling could feel like, which restrictions apply, and how imaging will confirm closure.