MASLD and Atherosclerosis in Patients with Type 2 Diabetes Mellitus: A Systematic Review

Background/Objectives: Metabolic dysfunction-associated steatotic liver disease (MASLD) is highly prevalent among patients with type 2 diabetes (T2D) and has been increasingly recognized as a potential contributor to cardiovascular (CV) disease. However, the relationship between MASLD and subclinical/clinical atherosclerosis remains controversial, with inconsistent findings across imaging modalities and study populations. Methods: A systematic review was conducted according to PRISMA guidelines and registered in PROSPERO (CRD420261347480). Literature searches were performed across the PubMed, Scopus, and Web of Science library databases from 1 January 2016 to 27 March 2026, using the terms: "MASLD AND (type 2 diabetes OR type 2 diabetes mellitus OR T2DM) AND atherosclerotic plaque" for each of the three databases. Inclusion criteria comprised original full-text English-language studies, published in the last 10 years and conducted in adults, reporting data regarding the evaluation of atherosclerosis in patients with T2D and MASLD/NAFLD. Exclusion criteria are letters to the editor, expert opinions, case reports, conference or meeting abstracts, reviews, and redundant publications; having unclear or incomplete data; and being performed in vitro (cell cultures) or in animal models. The quality of included studies was assessed using the Newcastle-Ottawa Scale. Results: The included studies, predominantly cross-sectional and a single longitudinal study, as well as different modalities of evaluating atherosclerosis, showed heterogeneous findings. MASLD is associated with increased carotid plaque progression, including in lean individuals. Its relationship with carotid intima-media thickness (CIMT) is inconsistent across studies, with some reporting higher values and others finding no significant association after adjustment. Hepatic fibrosis appears more strongly linked to vascular aging than steatosis alone, with variability likely due to differences in study methods and populations. Conclusions: The presence of both MASLD and T2D may be associated with atherosclerosis across different stages, from subclinical changes to clinically manifest disease, particularly at more advanced stages such as plaque presence or progression, whereas its relationship with early markers like pulse wave velocity or CIMT remains inconsistent. Liver fibrosis may represent a stronger determinant of atherosclerosis than hepatic steatosis alone. Although the evidence base is limited and largely derived from a small number of predominantly cross-sectional studies, further standardized and prospective research is warranted to better define these relationships and evaluate CV risk stratification in patients with T2D.