A 21-year-old man presented with a recent onset history of tingling and numbness of his left upper limb. He also had a 3 year history of anhydrosis affecting the left half of his face and left upper limb. Clinical and Doppler assessment did not reveal any vascular cause for his symptoms. However, a chest roentgenogram revealed a smooth mediastinal-based shadow in the left upper zone. Further imaging revealed a well-rounded left upper paravertebral tumour with cystic areas. There was no evidence of intraspinal extension. He underwent a video-assisted thoracoscopic surgical (VATS) excision of the tumour. Following this, he made an uneventful recovery.