_____ dilatation of an artery when compared with a more proximal segment.

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Multiple Choice

_____ dilatation of an artery when compared with a more proximal segment.

Explanation:
Dilatation of an artery when compared with a more proximal segment is described as ectatic. This term refers to a diffuse, segmental widening of the vessel rather than a localized sac. On ultrasound, an ectatic artery appears as a uniformly enlarged segment with the wall still intact and no discrete bulge. This differs from a true aneurysm, which is a localized dilation that involves all wall layers and can be fusiform (spindle-shaped) or saccular (a pouch with a neck). A pseudoaneurysm is a contained rupture where blood collects outside the vessel wall but communicates with the artery, producing a characteristic flow pattern at the neck.

Dilatation of an artery when compared with a more proximal segment is described as ectatic. This term refers to a diffuse, segmental widening of the vessel rather than a localized sac. On ultrasound, an ectatic artery appears as a uniformly enlarged segment with the wall still intact and no discrete bulge.

This differs from a true aneurysm, which is a localized dilation that involves all wall layers and can be fusiform (spindle-shaped) or saccular (a pouch with a neck). A pseudoaneurysm is a contained rupture where blood collects outside the vessel wall but communicates with the artery, producing a characteristic flow pattern at the neck.

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