Brainstem Tumors Safely and Effectively Treated With CyberKnife Therapy

by | Oct 3, 2025 | Brainstem Tumor Treatment

CyberKnife is a safe and effective treatment option for certain brainstem tumors, particularly those that are inoperable or located near critical structures. This non-invasive, image-guided radiosurgery system delivers high-dose radiation with sub-millimeter accuracy, minimizing damage to the surrounding healthy and sensitive brain tissue. 
How CyberKnife treats brainstem tumors
CyberKnife uses a robotic arm to deliver focused radiation beams from hundreds of angles, essentially “painting” the tumor with radiation. 
The treatment process for a brainstem tumor typically involves:
  1. Preparation: Unlike other radiosurgery systems that require an invasive head frame, CyberKnife uses a custom-fitted, non-invasive mesh mask to ensure the patient’s head remains still.
  2. Imaging: CT and MRI scans are used to determine the exact size, shape, and location of the tumor.
  3. Treatment planning: The medical team uses the scan data to create a customized treatment plan that focuses hundreds of radiation beams precisely on the tumor.
  4. Treatment delivery: During the outpatient session, the robotic arm moves around the patient to deliver radiation. Real-time imaging tracks and adjusts for any patient movement to maintain sub-millimeter precision.
  5. Sessions: Depending on the tumor, treatment is often completed in one to five sessions over a few days. This is known as fractionated stereotactic radiotherapy (FSRT).
Evidence for CyberKnife’s effectiveness
  • Brainstem metastases: A 2024 multicenter study showed effective local tumor control for brainstem metastases (BSM) treated with CyberKnife radiosurgery. The study found one-year, two-year, and three-year local BSM control rates of 82.9%, 71.4%, and 61.2% respectively, with low incidence of side effects.
  • Adult brainstem gliomas: A 2019 study on adult brainstem gliomas found CyberKnife treatment to be effective with mild toxicity. The one- and two-year overall survival rates were 87.5% and 52.4%. 
Potential side effects:
Due to the high precision of CyberKnife, side effects are often mild and temporary. However, as with any radiation therapy, risks exist. 
  • Common, temporary side effects: Fatigue, mild headaches, and nausea are possible shortly after treatment.
  • Delayed side effects: Inflammation and swelling in the brain can sometimes occur months after treatment. This can mimic tumor growth but can often be managed with anti-inflammatory medication like corticosteroids.
  • Nerve damage: The risk of damage to sensitive cranial nerves (affecting hearing or vision) is a concern, but it is minimized by the precise dose planning. 
CyberKnife vs. other treatments:
The location of brainstem tumors makes surgical removal very risky due to the critical structures in the area. CyberKnife is often a preferred, non-invasive alternative to surgery. 
Compared to other radiation treatments, CyberKnife has some distinct advantages:
  • CyberKnife vs. traditional radiotherapy: CyberKnife delivers a much higher dose of radiation directly to the tumor over fewer sessions (one to five vs. multiple weeks) and with greater accuracy, which minimizes damage to healthy tissue.
  • CyberKnife vs. Gamma Knife: Both are forms of radiosurgery. However, CyberKnife is a frameless system that delivers radiation from more angles and can accommodate a multi-session treatment plan (fractionation), which may be safer for larger tumors near critical structures. Gamma Knife often delivers a single, high-dose session and uses an invasive head frame.  

Cancer Treatment in Miami:

Keep in mind that the brain tumor will not suddenly disappear. In fact, it could take several weeks or longer for the full effect of the treatment to be known.

Response to treatment varies from patient to patient. Clinical experience has shown that most brain cancer patients respond very well to CyberKnife treatments.

CyberKnife radiosurgery has been used for more than three decades with extremely high rates of tumor control, and most patients are good candidates for treatment.

Patients who have been told that “there is nothing else that can be done” or that “surgery is too dangerous” may be perfect candidates for CyberKnife cancer treatment.

At CyberKnife Miami we have great success treating all types of brain tumors.If you have been told you have a tumor, you owe it to yourself to call CyberKnife Miami at (800) 204-0455 to see if you might be a candidate for CyberKnife stereotactic radiosurgery. Chance are you’ll be glad you did.