History: An 84-year-old man underwent anterior resection with primary anastomosis 8 days ago for sigmoid carcinoma. He has had ongoing confusion since the surgery. A CT scan of the abdomen is performed, including contrast through a rectal catheter.
1. Which of the following could be included in the differential diagnosis for widening of the presacral space? (Choose all that apply.)
2. Which of the following structures is the most likely to be disrupted in this patient?
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