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What Is Stereotactic Body Radiation Therapy?

Stereotactic body radiation therapy is a form of highly precise external-beam radiation therapy that delivers a large radiation dose to a defined tumor in a small number of treatment sessions. It is commonly abbreviated SBRT. Multiple carefully shaped beams converge on the target while treatment planning limits exposure to surrounding normal tissue. Unlike stereotactic radiosurgery, which is classically used for intracranial targets, SBRT is used for tumors outside the brain.

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What Is Stereotactic Body Radiation Therapy?

Stereotactic body radiation therapy is a form of highly precise external-beam radiation therapy that delivers a large radiation dose to a defined tumor in a small number of treatment sessions. It is commonly abbreviated SBRT. Multiple carefully shaped beams converge on the target while treatment planning limits exposure to surrounding normal tissue. Unlike stereotactic radiosurgery, which is classically used for intracranial targets, SBRT is used for tumors outside the brain.

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Why Is Stereotactic Body Radiation Therapy Performed?

SBRT is used for selected localized or limited metastatic tumors when a highly focused radiation treatment can provide effective local control. Common treatment sites include the lung, liver, spine, prostate, adrenal gland, and selected bone or lymph-node metastases. It can be an alternative to surgery for patients who are medically inoperable or can be chosen when tumor location and cancer type make focused radiation appropriate. Treatment decisions consider tumor size, motion, distance from sensitive organs, previous radiation, overall cancer stage, and the expected benefit compared with other radiation schedules.

How Is Stereotactic Body Radiation Therapy Performed?

Planning begins with simulation imaging that maps the tumor and nearby organs while the patient is positioned in a reproducible treatment setup. Immobilization and image guidance are used to maintain accurate alignment during each session, and breathing-motion management can be required for tumors in the chest or upper abdomen. A linear accelerator or other radiation system delivers multiple conformal beams that concentrate dose within the target. SBRT is commonly delivered in one to five fractions, although the exact schedule varies with tumor type, location, and normal-tissue dose limits.

What Is Recovery Like After Stereotactic Body Radiation Therapy?

SBRT is generally delivered as outpatient treatment and does not require surgical wound healing. Fatigue, localized soreness, skin changes, nausea, cough, or other short-term effects depend on the organ being treated and can appear during or shortly after the treatment course. Most patients resume usual activities quickly between sessions, although symptoms can accumulate temporarily as radiation effects develop. Follow-up imaging evaluates tumor response and also looks for delayed radiation changes in the treated tissues.

What Are the Risks and Complications?

SBRT can injure normal tissue near the target because each fraction uses a relatively high radiation dose. Potential complications depend on location and can include radiation pneumonitis in the lung, bowel or stomach injury in the abdomen, vertebral compression fracture after spine treatment, or nerve damage near sensitive neural structures. Some adverse effects appear months after treatment because radiation injury can develop gradually. Careful motion management, dose constraints, image guidance, and treatment planning are used to reduce these risks.

Frequently Asked Questions About Stereotactic Body Radiation Therapy

How many treatments are used for SBRT?

SBRT is commonly delivered in one to five treatment fractions, although the exact number depends on the tumor site, dose, and proximity to sensitive structures.

Is SBRT the same as stereotactic radiosurgery?

They use similar high-precision principles, but stereotactic radiosurgery is classically used for targets in the brain, while SBRT treats tumors elsewhere in the body.

Does SBRT require surgery?

No. It is a noninvasive external-beam radiation treatment delivered from a machine outside the body.

Can SBRT be used for metastatic cancer?

Yes. It can be used for selected patients with a limited number of metastatic sites when focused local treatment fits the overall cancer-management plan.

References

Definition of stereotactic body radiation therapy. National Cancer Institute. https://www.cancer.gov/publications/dictionaries/cancer-terms/def/stereotactic-body-radiation-therapy. Date Accessed September 11, 2026.

External Beam Radiation Therapy for Cancer. National Cancer Institute. https://www.cancer.gov/about-cancer/treatment/types/radiation-therapy/external-beam. Date Accessed September 11, 2026.

Stereotactic Radiosurgery (SRS) and Stereotactic Body Radiotherapy (SBRT). StatPearls (NCBI Bookshelf). https://www.ncbi.nlm.nih.gov/books/NBK542166/. Date Accessed September 11, 2026.

Stereotactic Body Radiotherapy for Lung Oligo-metastases: Systematic Review and International Stereotactic Radiosurgery Society Practice Guidelines. PubMed. https://pubmed.ncbi.nlm.nih.gov/37390723/. Date Accessed September 11, 2026.

Vertebral Compression Fracture After Spine Stereotactic Body Radiation Therapy: A Review of the Pathophysiology and Risk Factors. PubMed. https://pubmed.ncbi.nlm.nih.gov/29048517/. Date Accessed September 11, 2026.