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Effective treatment options for refractory depression are needed. Recent advancements permit both precise ablative radiation and functional neurologic connectome analysis using standard magnetic resonance imaging. We combined these innovations to perform stereotactic radiosurgical capsulotomy for the treatment of medically refractory major depressive disorder and study connectome response using a novel tractography-based approach.

Patients with medically refractory depression were enrolled on a prospective pilot single-arm observational trial from 2020 to 2021 at a single academic tertiary referral center. Bilateral ablation of the anterior limb of the internal capsule was accomplished by mask-based linear accelerator stereotactic radiosurgery. Beck's Depression Inventory measured efficacy. Montreal Cognitive Assessment evaluated cognition.

Three patients were …