PMID: 7539511May 1, 1995Paper

Medial neovascularization in abdominal aortic aneurysms: a histopathologic marker of aneurysmal degeneration with pathophysiologic implications

Journal of Vascular Surgery
D R HolmesR W Thompson

Abstract

The purpose of this study was to characterize the distribution of aortic wall microvessels in normal aorta, atheroocclusive disease (AOD), and abdominal aortic aneurysms (AAA) and to evaluate whether medial neovascularization (MNV) is a reliable histopathologic marker of aneurysmal degeneration. Aortic tissue specimens (9 normal, 10 AOD, and 10 AAA) were examined for elastin with Verhoeff-van Gieson stain and for Ulex europaeus type I lectin, an endothelial-specific antigen, and laminin, a marker of basement membranes, by immunohistochemistry. The density of MNV was determined by morphometry of aortic sections stained for endothelium. The spatial distribution of aortic microvessels was compared with that of elastin destruction and chronic inflammation. Evidence of medial neovascularization was generally not observed in normal aorta or AOD, whereas AAAs showed strong spatial correlations between MNV, disruption and degradation of elastin, and chronic inflammation in the outer aortic wall. Several specimens of AOD had focal areas of MNV associated with localized elastin fragmentation and monocytic infiltration located at the interface between the atherosclerotic plaque and the inner media. The density of MNV was about fifteenfold...Continue Reading

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