Image of the Week: What disorder is a risk factor for this presentation?

A 71-year-old man with a history of atrial fibrillation and hypertension presents to the emergency department with a one-day history of severe abdominal pain. On examination, his vital signs are stable and laboratory findings reveal an expected INR of 2.8 but are otherwise unremarkable. A palpable tender mass can be felt in the right lower quadrant of his abdomen. When the patient sits up, the location of his pain remains unchanged. A CT scan reveals the findings seen here. Which of the following is a risk factor for this patient’s presentation? Learn more about this case, take the quiz, and join the conversation on Figure 1.

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