Most cases of thoracic outlet syndrome are detected by neulogical symptoms, and most of the other symptoms are caused by arterial stenosis. It is rare for the syndrome to be recognized by venous symptoms. We report a 56-year-old woman with thoracic outlet syndrome recognized by arm swelling. She was admitted for radiation therapy of a recurrent tumor of lung cancer at the left apex. Her right arm gradually became swollen. We performed venography from the right median cubital vein because of suspected venous thrombosis. Venography revealed stenosis of the right subclavian vein at the costoclavicular space, and this finding was confirmed by helical CT. These findings strongly support our diagnosis of thoracic outlet syndrome.
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