[Thrombosed aneurysm of the subclavian vein].

Progressive growth of a thrombosed aneurysm in the venous neck vessels represents an important differential diagnosis in solitary cervical swelling. We report the case of a 72-year-old woman with a 4-month history of left cervical, supraclavicular swelling. CT showed a cystic tumour with a maximum diameter of 4.8 cm at the left jugulobrachial venous arch. Surgical removal revealed a firm elastic tumour, which arose from the subclavian vein. Histological analysis showed a thrombosed venous vessel.