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CR - Aneurysms (capill microhaemorrhages (<1cm, associated with…

- - - - most common
      - over 50s
      - AAA = most common (usually below renal arts :smiley:)
      - may present as rupture + death
      - emboli source (thrombus/platelet/chol)
    - - e.g. Berry aneurysms in circle of willis
        
        rupture causes subarachnoid haemorrhage (fatal in 1/3)
        
        saccular
        
        most common type of intracranial anuerysm
        
        90% ant
        
        causes
        
        sporadic
        
        smoking
        
        hypertension
        
        genetic
        
        polycystic kidney disease
        
        Ehlers-Danlos
        
        Marfan's
    - - often results in false aneurysm (blood between media + adventitia)
  - - - separates all 3 layers
      - can be in any art
      - thoracic aorta most common
        
        often ruptures - massive haemorrhage :cry:
        
        haemopericardium if ruptures within pericardium :cry:
        
        cystic medial degeneration
        
        types of patients
        
        40-60 y/o men, >90% hypertensive (cystic medial degeneration)
        
        if youger - Marfan's (cystic medial degeneration) - abnormal connective tissue
        
        intimal tear = complication of art cannulation
        
        pregnancy (esp gestational hypertension + toxaemia)
        
        usually no marked dilatation
      - blood-filled channel with wall
        
        dissecting intramural haematoma
        
        narrows art
        
        can rupture
      - oblique intimal tear allows blood to enter media