During a busy day in the emergency room, a 37-year-old male presents complaining of acute epigastric abdominal pain, describing it as ‘shooting straight through to my back.’ He also states that he has not been able to eat because of nausea and vomiting. On examination, the patient is afebrile and uncomfortable, and he requests medication for his pain. He appears intoxicated. The abdominal exam reveals mild distention, absent bowel sounds, and extreme pain on palpation, but no rebound tenderness. Initial lab results show elevated amylase and lipase levels. A KUB shows multiple calcifications in the abdomen. Which diagnosis best explains these results?
A. Aortic dissection