Figure 6 Keyword co-occurrence analysis. (A) Classification of keywords in the AAA rupture field: Cluster 1 (28 items): red; Cluster 2 (27 items): green; Cluster 3 (24 items): blue; Cluster 4 (23 items): yellow; Cluster 5 (12 items): purple. The size of the circle indicates the frequency of occurrence, and the distance of the circle indicates the number of co-occurrences. (B) Average year of publication distribution of keywords; blue indicates more distant keywords, yellow indicates more recent keywords. (C) According to the distribution of keywords with average frequency of occurrence, red indicates the highest frequency of occurrence (VOSviewer, version 1.6.16, Leiden University).