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NBME 24 Answers

nbme24/Block 1/Question#10
A 75-year-old man is brought unconscious to ...

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hope this helps everyone, even the ones that just "like" everything

NOT MARFAN: True abdominal aortic aneurysm (AAA) in patients with Marfan syndrome is relatively rare because most aortic aneurysms in this disease are dissecting aneurysms in the thoracic area.

Given the diagnosis of AAA, why did he have syncope? I was first thinking it was from rupture, but his blood pressure is not hypotensive, so how could he get syncope from that.

Or maybe the AAA was compressing the inferior vena cava, causing syncope?

obgynnycstep1  https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6178120/ worth taking a look +  

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submitted by keycompany(208),

Image shows Crescent Sign, a common finding in Abdominal Aortic Aneurysms due to mural thrombus occlusion.

happysingh  crescent sign is a finding on radiographs that is associated with avascular necrosis, NOT aneurysms !!! what you're seeing is Calcification of wall of the aortic aneurysm +11  
sabistonsurgery  @happysingh - Thank you. You are correct indeed. +  
suckitnbme  Adding on, this patient is a >65 yo Male with a 120 pack year smoking history. Both are significant risk factors for AAA. +  

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