Permanent focal dilation of an artery due to weakening of the arterial wall of greater than 1.5 times its normal diameter. Most commonly in the aorta, popliteal and femoral arteries.

90% are associated with atherosclerosis

Different shapes – fusiform (diffusely dilated; irregular) and saccular (outpouching)

Thrombus can develop in aneurysm.
May get pain from compression of surrounding structures,

Often found on routine clinical examination – about 20% cause symptoms

Popliteal artery aneurysm:
• Most common peripheral artery aneurysm; mostly in males in 6th decade of life
• can occur just distal to knee and are associated with atherosclerosis; less common causes include trauma’ knee replacement surgery, arteritis and bacteraemia.
• rarely rupture (only 5% of time)
• presentations vary – from intermittent claudication to ischaemic gangrene
• thrombosis often develops and can embolise to arteries of calf and foot  acute arterial ischaemia
• treatment is by surgical repair

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