Notably, the levels of <sup>68</sup>Ga-FAPI-04 uptake in a rabbit model of abdominal AA (AAA) is positively correlated with aortic dilation (r = 0.84, p < 0.01), and the histological examination further confirmed that regions of high <sup>68</sup>Ga-FAPI-04 uptake exhibited both increased FAP expression and more severe pathological changes. The gene discussed is FAP; the disease is triple-A syndrome.