Key Facts

• The most common peripheral aneurysm.
  
• Fifty per cent are bilateral.
  
• Fifty per cent also have an AAA.
  
• Mainly men in their 60s.

Presentation

The key thing to understand is that popliteal aneurysms rarely rupture: they thrombose acutely, resulting in a severely ischaemic foot that requires emergency bypass. They may also present with:

• a pulsatile mass behind knee
  
• emboli to foot (trashing).

Investigation

• Duplex U/S to size.
  
• CT or MR angiogram.

Treatment

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