Magnetic resonance imaging has been used to compare the involvement of the parietal vs frontal branch in temporal arteritis. In 21 patients with suspected giant cell arteritis, involvement was rated by noting the amount of mural thickening and gadolinium enhancement of the vessel and perivascular tissue.4 On the left side, abnormalities were present in 14 patients in the frontal branch and in 6 patients in the parietal branch. On the right side, involvement was noted in 11 patients in each branch. These data hint that arteritis may be more prevalent in the frontal branch than the parietal branch. Notably, in the majority of patients who had imaging signs of temporal arteritis, abnormalities were present in one branch but not the other, at least on one side. Although neuroimaging is not equivalent to the gold standard of histopathological analysis, this result suggests that selective involvement of a single branch of the superficial temporal artery is not rare.