Can Neurosurgery Be Performed Without an Incision?
For decades, the idea of psychiatric neurosurgery has been met with both hope and hesitation. While procedures targeting specific brain circuits can provide meaningful relief for individuals with severe, treatment-resistant psychiatric disorders, traditional approaches often require invasive surgery, implanted hardware, or permanent lesions created through electrodes or radiation.
Today, advances in technology are changing that paradigm.
A recently accepted review in Biological Psychiatry highlights the growing role of magnetic resonance-guided focused ultrasound (MRgFUS). This technology allows physicians to create highly precise therapeutic brain lesions without making a surgical incision.
For patients with severe, treatment-resistant psychiatric illness, focused ultrasound may represent an important new therapeutic option.
What Is Focused Ultrasound?
Focused ultrasound uses more than 1,000 ultrasound beams directed through the skull and converged on a precise target deep within the brain.
When these beams meet, they generate sufficient heat to create a small, carefully controlled lesion while leaving surrounding tissue largely unaffected. MRI guidance allows physicians to monitor the process in real time and verify the target’s location and temperature throughout the procedure.
Unlike conventional surgery, focused ultrasound:
This combination has led many investigators to view MRgFUS as a transformative platform in functional neurosurgery.
Why Target Brain Circuits?
Modern psychiatry increasingly recognizes that disorders such as obsessive-compulsive disorder (OCD) and major depressive disorder (MDD) involve dysfunction within specific neural circuits rather than isolated brain regions.
One key target is the anterior limb of the internal capsule (ALIC). This major communication pathway connects frontal brain regions to deeper structures involved in emotion, motivation, and cognitive control.
By disrupting maladaptive signaling within these circuits, focused ultrasound may reduce symptoms that have persisted despite years of conventional treatment.
The Strongest Evidence: Obsessive-Compulsive Disorder
The most compelling data to date come from studies of treatment-resistant OCD.
Across independent clinical trials, patients experienced substantial and sustained improvements in symptoms following focused ultrasound capsulotomy. Some studies reported:
Perhaps most importantly, many patients were able to re-engage in evidence-based psychotherapy after treatment, suggesting that neuromodulation may create a therapeutic window that facilitates broader recovery.
What About Depression?
The evidence for major depressive disorder is promising but more mixed.
Early studies demonstrated rapid and meaningful improvements in some patients with treatment-resistant depression. However, larger cohorts have shown more variable outcomes than those observed in OCD.
Researchers believe this may reflect the biological heterogeneity of depression. Unlike OCD, which appears more tightly linked to circuitry traversing the anterior limb of the internal capsule, depression likely involves multiple circuit-based subtypes that may require different targets or lesion configurations.
This observation reinforces an important principle of modern psychiatry:
The future of neuromodulation is precision targeting.
How Does Focused Ultrasound Compare With Deep Brain Stimulation?
Deep brain stimulation (DBS) remains one of the most sophisticated neuromodulation treatments available for severe psychiatric illness.
However, DBS requires:
Focused ultrasound offers a different approach.
It provides:
The trade-off is that focused ultrasound produces a permanent lesion, whereas DBS remains adjustable and reversible. Both approaches have important roles, and patient preference is likely to become an increasingly important factor in treatment selection.
Safety and Cognitive Outcomes
One of the most encouraging findings from focused ultrasound studies is the favorable safety profile.
Across reported psychiatric trials:
This is particularly important given historical concerns regarding psychiatric neurosurgery and cognitive side effects.
The Future: Beyond OCD and Depression
Researchers are already exploring additional applications of focused ultrasound for psychiatric disorders.
Potential future indications include:
The field is also investigating low-intensity focused ultrasound, which may allow reversible modulation of brain circuits before committing to a permanent lesion.
These advances could dramatically expand the role of focused ultrasound within psychiatric care.
UTHealth Houston Perspective
At the Center for Interventional Psychiatry at UTHealth Houston, we closely follow emerging neuromodulation technologies that have the potential to improve outcomes for patients with severe and treatment-resistant psychiatric disorders.
Focused ultrasound is particularly exciting because it combines several features that define the future of interventional psychiatry:
Although focused ultrasound for psychiatric disorders remains investigational, the growing body of evidence suggests it may become an important addition to the therapeutic armamentarium alongside TMS, ECT, ketamine, vagus nerve stimulation, and deep brain stimulation.
Final Thoughts
The history of psychiatric neurosurgery has been one of continuous refinement—from large, imprecise procedures to highly targeted interventions guided by neuroscience.
Focused ultrasound represents the latest step in that evolution.
By allowing clinicians to target dysfunctional circuits without an incision precisely, MRgFUS may help redefine how we approach some of the most severe and treatment-resistant psychiatric illnesses.
While important questions remain regarding patient selection, optimal targeting, and long-term outcomes, the field is moving rapidly.
The future of psychiatric neuromodulation may be quieter, more precise, and remarkably less invasive than anyone imagined just a decade ago.
Reference
Xhima K, Davidson B, Rabin J, et al. Focused ultrasound ablation for psychiatric disorders. Biological Psychiatry. Accepted May 2026.
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Disclaimer
This article discusses findings from a recently accepted scientific publication and is intended for educational and informational purposes only. The content reflects the scientific evidence available at the time of writing and does not constitute medical advice. Focused ultrasound for psychiatric disorders remains investigational and is not currently approved for routine clinical use in most psychiatric indications.
This article was created with the assistance of artificial intelligence (AI) to help organize and refine the presentation of scientific information. All medical and scientific content has been reviewed and approved by Joao L. de Quevedo, MD, PhD, Executive Director of the Center for Interventional Psychiatry at the John S. Dunn Behavioral Sciences Center at UTHealth Houston.