This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Radiology
This patient presented to the emergency depament with abdominal pain. What is the MOST significant diagnosis? 
Select and explain. 
A. Superior mesenteric aery embolus, B. Superior mesenteric vein thrombosis, C. Aoic dissectionLeaking aoic aneurysm, D. Leaking aoic aneurysm
A: Superior mesenteric aery embolus
Answer: A: Superior mesenteric aery embolus 
Explanation: There is a paially occlusive filling defect or defects within the contrast opacified superior mesenteric aery characteristic for a thromboembolus.