Peripheral Vascular MRA

Figure 1

History: 72-year-old female presents with severe bilateral calf and foot pain with walking.

She was referred to Main Street Radiology for Magnetic Resonance Angiography (MRA) of the abdomen, pelvis and lower extremities.

Findings: Anterior MRA images (Figure 1) show moderate focal stenosis of the distal aorta (arrow #1). The right iliac arteries are occluded (arrows #2). There is occlusion of the left superficial femoral artery (arrow #3). The left popliteal artery is reconstituted just below Hunter's Canal and is mildly stenotic (arrow #4).

Lateral MRA image of the right calf and foot (Figure 2) shows single vessel runoff via a widely patent peroneal artery (arrow #5), which supplies the posterior tibial artery via a collateral (arrow #6). It fills the dorsalis pedis and distal anterior tibial artery (arrow #7) in a retrograde fashion via a patent pedal arch. The anterior and posterior tibial arteries are occluded in the calf.

Anterior images (Figure 1) show two vessel runoff on the left side via the peroneal and posterior tibial arteries (arrows #8). Lateral MRA image of the left calf and foot (Figure 3) shows patent but attenuated plantar arteries (arrow #9) and occluded dorsalis pedis (arrow #10).

Discussion: Peripheral vascular disease (PVD) affects approximately 10 million people in the United States and about 1 in 20 people over the age of 50. Despite being symptomatic in more than half of these people, less than a quarter receive any form of treatment. Many patients mistakenly believe that the symptoms are a normal part of aging.

The most common symptom of PVD is reproducible painful cramping in the legs or buttocks, particularly when walking, that resolves with rest (claudication). Other symptoms include numbness, tingling, burning, cold leg or foot, as well as skin breakdown and non-healing ulcers or infections. The risk factors include: age over 50, smoking, diabetes, obesity, lack of exercise, hypertension, and high cholesterol. Patients can often be treated using percutaneous techniques.

Figure 3
Figure 2

Peripheral MRA is performed routinely at MSR on our high-field magnet using the latest 3D dynamic and time-resolved protocols. With time-resolved MRA, multiple images are sequentially acquired at 10 second intervals. After 3D post processing, the subsequent images are very similar to a conventional angiogram. The entire exam takes less than 40 minutes and is non-invasive. It does require an IV injection of Gadolinium, which is not nephrotoxic.