ABSTRACT
This chapter describes the term “aneurysm” for any significant venous dilatation, whether saccular or fusiform. Most of the recommendations regarding the management of venous aneurysms are supported only by anecdotal and retrospective experience. Aneurysmal dilatation of veins is often observed in association with either high-flow states or congenital venous malformations. The pathogenesis of venous aneurysms found in association with major vascular malformations is somewhat easier to understand. The reason for the frequent occurrence of venous aneurysms in the popliteal vein is unknown, but may be related to the findings of Lev and Saphir. The popliteal vein is believed to be the most common site of venous aneurysms, with at least 208 cases reported in the literature. Venous aneurysms of the extremities can develop in the superficial or in the deep venous systems. Thoracic aneurysms can arise from the superior vena cava, the azygos vein system, or the innominate and subclavian veins.
