Case report: an unusual case of the superior vena cava syndrome--aneurysm of an aberrant right subclavian artery.

A case of aberrant right subclavian artery (RSA) aneurysm presenting solely with symptoms and signs of superior vena cava obstruction (the SVC syndrome) is described. The SVC syndrome is usually a consequence of mediastinal malignancy and only rarely due to compression by an arterial aneurysm.