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How can an aneurysm cause atrophy of nearby tissue or bone?

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atrophy One example of atrophy is the progressive loss of bone that occurs in osteoporosis (normal bone shown on left; osteoporotic bone shown on right).

An aneurysm is a localized widening of an artery caused by a weakness in the vessel wall. As the aneurysm enlarges, it can cause atrophy in nearby tissues or bones primarily through the mechanism of prolonged pressure.12

When an expanding mass—such as an aneurysm—impinges upon adjacent structures, the constant mechanical pressure interferes with the normal environment of those tissues. Just as the pressure from an expanding tumor or fluid accumulation can result in the localized atrophy of adjacent brain substance or bone, the persistent force exerted by an enlarging aneurysm can lead to the wasting away or degeneration of the surrounding structures it presses against. This process highlights how physical compression, if sustained over time, disrupts the integrity and health of neighboring anatomical components.21