Which statement about popliteal aneurysms is TRUE?

Popliteal aneurysms are characterized by the dilatation of the popliteal artery, which can pose significant risks, especially in relation to the formation of thrombi. When these aneurysms develop, they can lead to the formation of emboli that can travel downstream and occlude smaller arteries in the leg, resulting in ischemia. This embolic event is a critical concern as it can result in acute limb ischemia, which may necessitate urgent interventions to prevent limb loss.

The other statements do not accurately reflect the nature of popliteal aneurysms. For instance, while popliteal aneurysms can be associated with abdominal aortic aneurysms (AAAs), they do not "rarely" coexist. Furthermore, although popliteal aneurysms can rupture, they are more commonly noted for the risk of embolism rather than a very high rupture risk. Lastly, while some popliteal aneurysms are asymptomatic, they can also present with symptoms due to embolization or other complications; therefore, stating they are usually asymptomatic could be misleading in a clinical context.