We report two cases in which patients with Parkinson's disease underwent unilateral magnetic resonance imaging–guided focused ultrasound (MRgFUS) thalamotomy for medication–refractory tremors. Both patients were males in their 70s, and their resting tremors disappeared immediately during the procedure ; however, severe bradykinesia and gait disturbance persisted. The administration of corticosteroids for severe edema around the targeted lesions ameliorated the bradykinesia and gait disturbance. In addition to the Unified Parkinson's Disease Rating Scale, serial examinations of gait function, including the timed up & go test and the comfortable gait speed in 10–m walking test, were useful for evaluating the patients' motor functions.