Motor cortex electrical stimulation was first used in the clinical treatment of central pain in 1989.Recently,this technique has been used to treat post-stroke movement disorders and better efficacy has also been obtained.Its mechanisms may include regulating cortex-basal ganglia circuits,exciting the activation of the motor cortex on the affected side but inhibiting the activation of the motor cortex on the contralateral side.regulating the plasticity of brain and resynchronization of electric activity.This article reviews the possible mechanisms,operative methods.clinical efficacy and existing problems.

Glioblastoma multiforme (GBM) is the most common primary brain tumor and the most malignant astrocytoma in adults, with rare extra-cranial metastases, especially for subcutaneous metastases. It could be easily misdiagnosed as primary subcutaneous tumor. In this report, we describe a patient with pontine GBM who developed a subcutaneous swelling at the ipsilateral posterior cervical region 8 months after operation, and the pathological and immunocytochemical examination carry the same characteristics as the primary intracranial GBM cells, which defined it as subcutaneous metastasis. GBM with subcutaneous metastasis is extremely rare, and knowledge of a prior intracranial GBM, pathological examinations and immunocytochemical tests with markers typically expressed by GBM are of vital importance for the diagnosis of GBM metastasis. Surgical resection of subcutaneous swelling, followed by chemotherapy and radiotherapy, could be the best strategy of treatment for the patients with GBM subcutaneous metastasis.
Adult ; Astrocytoma ; Brain Neoplasms ; Glioblastoma ; Humans ; Neoplasm Metastasis