Kamtchum-Tatuene J, Wilman A, Saqqur M, et al. - Given that nearly 40% of patients with embolic stroke of undetermined source exhibit an ipsilateral mild carotid stenosis, defined as plaque with < 50% luminal narrowing, researchers sought to determine the frequency of mild carotid stenosis with high-risk features in embolic stroke of undetermined source. Searching Pubmed and Ovid-Embase, they included eight studies enrolling 323 participants. Findings suggest a 5 times higher prevalence of plaques with high-risk features in the ipsilateral compared with the contralateral carotid in the embolic stroke of undetermined source, implying a relationship to stroke risk.