Computed Tomography (CT) angiography is the most used imaging technique to assess popliteal artery aneurysms (PAA). It allows measurement of the size of the aneurysm, evaluates its position and extension, the presence of intrasaccular thrombus and the permeability of distal run-off. It can also assess upstream arterial disease and, in particular, the presence of associated aneurysms on the thoraco-abdominal aorta, the iliac arteries or the common femoral arteries. To achieve optimal arterial opacification, attention must be paid to the fact that blood flow velocity can be very slow in aneurysms and different between the right and left limbs. It may therefore be useful to systematically perform a delayed acquisition on distal run-off, in addition to the conventional arterial-phase acquisition. CT angiography is the standard test for discussing therapeutic management. CT angiography limitations include use of iodinated contrast medium, susceptibility to knee prosthesis-induced artefacts and difficulties in assessing distal run-off permeability in case of diffuse mediacalcosis. Gadolinium-enhanced Magnetic Resonance (MR) angiography can be used to image lower limbs vessels without requiring iodinated contrast medium injection. Additional pulse sequences ( e.g. , T1-weighted imaging) are required to assess intrasaccular thrombus. MR angiography limitations include a relatively low spatial resolution that may hinder run-off assessment and susceptibility to knee prosthesis-induced artefacts. Intra-arterial angiography remains the most precise technique for evaluating distal run-off and may be necessary for optimal treatment planning, especially in patients with impaired run-off due to multiple embolic episodes. Intra-arterial angiography is the standard test for stent placement.