Liu CY, et al. - Researchers conducted this systematic review and meta-analysis to assess the correlation between psoriasis and multiple sclerosis (MS). They searched MEDLINE, Embase, and CENTRAL databases in July 2018 for case-control, cross-sectional, or cohort studies that examined either the odds or risk of psoriasis in patients with MS. A total of 11 studies (5 case-control, 4 cross-sectional, and 2 cohort studies) were included; the case-control and cross-sectional studies included 18,456 patients with MS and 870,149 control participants, and the two cohort studies included 25,187 patients with MS and 227,225 control participants. Both increased prevalence and incidence of psoriasis were evident in patients with MS.