Immunohistochemical studies identified infiltration of lymphatic vessel endothelial hyaluronan receptor (LYVE) −1, vascular endothelial growth factor (VEGF)-C, and matrix metalloproteinase (MMP)-9-positive macrophages and podoplanin and Prox-1-positive microvessels in the intima/media in AAA wall, where hypoxia-inducible factors (HIF)-1α was expressed. The gene discussed is MMP9; the disease is triple-A syndrome.