Review Question - QID 212692

A 36-year-old man presents to the emergency department complaining of exquisite abdominal pain for the past 3 hours. He was watching TV when suddenly he felt an intense, 10/10, stabbing pain at his right abdomen. Since the onset of symptoms, he has taken 2 ibuprofen and 2 regular strength acetaminophen with no improvement. He denies any headache, fever, vision changes, chest pain, diarrhea, or sensory changes. However, he reports some nausea and reddish-colored urine this afternoon. His medical history is significant for Crohn disease that is well-controlled with azathioprine. A non-contrast computed tomography (CT) scan is obtained, and the results are shown in Figure A. What is the most likely explanation for this patient’s findings?