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Post-trauma chronic pain characterized by central pain is a symptom following traumatic brain injury (TBI). Studies on the effect of repetitive transcranial magnetic stimulation (rTMS) on central pain and the association between central pain and spinothalamic tract (STT) have been reported, but few studies have examined the effect of rTMS in patients with mild TBI with central pain through changes in diffusion tensor imaging (DTI)-based metrics of STT before and after rTMS. This case series aimed to investigate the therapeutic effect of rTMS in TBI with central pain and the changes in diffusion tensor imaging (DTI)-based metrics of the spinothalamic tract (STT) before and after rTMS. This study included four patients who complained of severe pain in the left or right side of the body below the neck area after a car accident. We performed numeric rating scale (NRS), bedside sensory examination, electrodiagnostic study, and DTI-based metrics of the STT before and after rTMS. According to the guidelines of the diagnosis and grading for neuropathic pain, all patients had neuropathic pain corresponding to "probable grade." In all patients, rTMS was applied to the contralateral M1 cortex on the more painful side. There were no medication changes and other interventions during the rTMS. After rTMS, NRS decreased, bed sensory testing improved, and DTI-based STT metrics increased in all patients compared to before rTMS.

Changes in Diffuse Tensor Imaging and Therapeutic Effect of Repetitive Transcranial Magnetic Stimulation in Traumatic Brain Injury with Central Pain