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A case of brachial plexus neurinoma was reported with a review of the literature.A 31-year-old woman had an enlarging mass of 4 to 5cm in the right supraclavicular area for about six months. Tingling, radiating into the right shoulder and the arm, appeared on moving the mass. The ovoid, elastic hard gray tumor was removed intracapsularly from the sheath of the lower trunk of the right brachial plexus. The tumor was revealed to be a neurinoma of the Antoni A and B mixed type on histological examination. Her postoperative course was benign exept for slight weakness of the grasping power of her right hand which gradually improved in two weeks.