aneurysmal dilatation
Abnormal focal enlargement of a blood vessel to more than 150% of its normal diameter, creating a weakened, bulging area.
Full Definition
Aneurysmal dilatation refers to the pathological widening of a blood vessel beyond 1.5 times its normal diameter, resulting in a localized bulging or ballooning of the vessel wall. This condition can occur in arteries throughout the body, with the aorta, cerebral arteries, and peripheral vessels being commonly affected. The dilatation may be fusiform (spindle-shaped) or saccular (berry-shaped), and poses risks of rupture, thrombosis, or embolization. Vascular imaging is essential for detecting, measuring, and monitoring aneurysmal dilatation over time. Editors must distinguish between 'dilatation' (the preferred medical term) and 'dilation,' and ensure accurate measurement reporting in millimeters or centimeters.
Usage
Usage note: Use 'dilatation' rather than 'dilation' in medical contexts. Always include measurements when describing aneurysmal dilatation.
In Context
- "CT angiography demonstrated aneurysmal dilatation of the ascending aorta measuring 4.8 cm." — Cardiac surgery evaluation
- "The cerebral angiogram revealed saccular aneurysmal dilatation at the anterior communicating artery." — Neurosurgical consultation