Clubbing due to peripheral hypervascularization: recognition by contrast-enhanced, three-dimensional magnetic resonance angiography.

Recognition by Contrast-Enhanced, Three-Dimensional Magnetic Resonance Angiography To the Editor: The magnetic resonance angiogram of the left hand shown by Wiesmann et al1 is an incomplete display of the arteries that is further confounded by venous contamination. From this image, one cannot conclude that “there is no evidence of vasculitis or arterial stenosis or occlusion.” Spatial resolution of a fraction of a millimeter is required to diagnose vasculitis in the hand. Only conventional angiography, usually with intraarterial vasodilators, provides the required spatial resolution.