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Type 2 diabetes mellitus (T2DM) is a known risk factor for AD and may contribute to cerebellar atrophy, but their relationship remains unclear.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Objective<\/jats:title>\n                    <jats:p>This study investigated the impact of T2DM on cerebellar gray matter (GM) volume across normal cognition (NC), preclinical AD, and AD mild cognitive impairment (AD MCI) groups to explore its role in AD progression.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>Medical records of patients visiting St. Vincent's Hospital (September 2019\u2013April 2024) were analyzed. Cerebellar GM volume was analyzed using voxel-based morphometry with SPM12. Group differences in cerebellar GM volume were assessed using rank analysis of covariance. Spearman's partial correlation was used to explore associations between cerebellar GM volume and cognitive function, and HbA1c levels in patients with T2DM.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>AD MCI patients with T2DM showed greater GM atrophy, particularly in the posterior lobe. In NC, T2DM was associated with Vermis VI volume reduction, while preclinical AD showed increased Left VIIIb volume. Amyloid-\u03b2 positive (A\u03b2+) group has negative correlation HbA1c level and right Crus I volume. Cerebellar GM volume correlated with cognitive scores, particularly episodic memory in AD MCI patients with T2DM.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>T2DM and AD pathology contribute to cerebellar changes linked to cognitive decline. Managing T2DM may mitigate its impact on AD progression.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1177\/13872877251352208","type":"journal-article","created":{"date-parts":[[2025,6,27]],"date-time":"2025-06-27T09:39:07Z","timestamp":1751017147000},"page":"1533-1544","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":1,"title":["Impact of type 2 diabetes mellitus on differential cerebellar volume reduction in Alzheimer's disease trajectory"],"prefix":"10.1177","volume":"106","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3719-5270","authenticated-orcid":false,"given":"Suhyung","family":"Kim","sequence":"first","affiliation":[{"name":"Department of Psychiatry, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea"},{"name":"Department of Psychiatry, St. Vincent's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of 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