Erratum

In this Perspective article, the Box title should read: “Computed tomography (CT) venogram image showing maximally compressed left common iliac vein (blue arrow) and distal abdominal aorta just before it bifurcates (red arrow). The sequential CT images (not shown) demonstrate a thrombus in the external iliac vein and left common iliac vein as it passes posterior to the proximal right common iliac artery, suggestive of May–Thurner syndrome”.