Dilatation of artery/heart due to congenital or acquired weakness/injury to wall

true: dilation of all three vessel layers either on one side (saccular/berry) or both (fusiform)

false: caused by dissection of tunica intima, allowing bleeding between layers and compression of lumen as trapped blood volume increases.

<aside> 💡 extravasation into wall is dissection, outside wall is haematoma.

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Demographics

50yo men most common

Risk Factors

• Smoking
• FHx
• Atherosclerosis
• HTN
• Hypercholesterolaemia
• Marfans, Ehlers-Danlos, Turner’s
• Other aneurysms

Aetiology

• Congenital
  • Marfan’s - defective Fibrilin & Elastin.
  • Ehler-Danlos Sy. – defective Collagen synthesis.