A 52-year-old man comes to the emergency department because of sudden onset of severe abdominal pain, vomiting, and bloody stool. He has advanced hereditary hemochromatosis with cirrhosis and hepatocellular carcinoma. Blood pressure is 95/60. Exploratory celiotomy is performed. Half of the small intestine is thickened and has a dark red-purple hemorrhagic appearance. Which of the following is the most likely diagnosis?
Acute mesenteric ischemia
Acute on chronic mesenteric ischemia
Ischemic colitis
Mesenteric venous thrombosis
Necrotizing enterocolitis
