Diagnostic Approach for Popliteal Artery Entrapment Syndrome

Initial Diagnostic Considerations

The American College of Radiology recommends suspecting PAES in young adults with calf claudication, paresthesia, and swelling during exercise, especially in athletes 1, 2
Evaluate for absence of atherosclerotic risk factors, which helps distinguish PAES from atherosclerotic disease 2

The American College of Radiology suggests using ultrasound duplex Doppler as the initial test due to its ability to visualize flow dynamics and vessel caliber changes in real-time, demonstrate flow disturbances during dynamic maneuvers, show exercise-induced vasospasm, and detect intravascular lesions with higher sensitivity than MRA 3
The American College of Radiology recommends MR Angiography (MRA) as a confirmatory test after ultrasound because it can define complete anatomy of the popliteal fossa, evaluate vascular abnormalities and dynamic changes during plantar flexion, and is superior to digital subtraction angiography (DSA) in confirming PAES 1, 4
CT Angiography (CTA) may be considered when MRA is contraindicated, as it can depict popliteal vascular changes, visualize abnormal musculotendinous structures, and allow dynamic imaging at both rest and plantar flexion with a single contrast bolus 1, 4
Selective Arteriography should be reserved for confirmation when PAES is suspected on cross-sectional imaging or ultrasound, identifying dynamic arterial deviation/occlusion during plantar flexion, and detecting vascular occlusion, stenosis, aneurysm, or thrombosis 1, 4

Many patients are unable to maintain steady forced plantar flexion throughout MR sequences, which can degrade image quality 1, 4
Arteriography is limited by its inability to depict extravascular anatomy 1, 4

Non-invasive vascular labs show significant ankle-brachial index drops with exertion (to 0.56 right, 0.46 left) in a young athlete with functional popliteal artery entrapment syndrome, according to the American College of Radiology 5

The American College of Radiology recommends surgical exploration for suspected PAES when diagnostic imaging confirms the condition, to prevent progressive arterial wall degeneration 5
The American College of Cardiology indicates that significant functional disability, such as preventing participation in sports for approximately one year, is an indication for surgical intervention in patients with PAES 6