An abnormal widening or ballooning of a blood vessel resulting from a wall weakness is called:

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An aneurysm is a type of abnormal dilation or ballooning of a blood vessel caused by a weakness in the wall of the vessel. Stenosis is the narrowing of a blood vessel, commissure refers to the point of attachment between two heart valve cusps, sclerosis is the thickening and hardening of artery walls, and angiopathy is a generic term for a disease of the blood vessels.

An Abnormal Widening or Ballooning of a Blood Vessel Resulting