A 68-year-old man is admitted to the ICU following a major cardiac surgery. On postoperative day 5, while on mechanical ventilation and TPN support, he develops unexplained fever (38.5°C), leukocytosis (WBC 14,500/μL), and elevated liver enzymes. Bedside ultrasound is performed. The structure marked **A** in the diagram shows a distended thick-walled gallbladder with pericholecystic fluid but no gallstones. Which of the following is the most likely diagnosis and the primary reason for the high mortality in this condition?
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