You are treating a 49-year-old patient who complains of an intense pain between his shoulder blades radiating to his lower back. Pain began 10 minutes prior to your arrival while he was eating and has been constant. He rates the pain as a 10 out of 10. Pain is described as a sharp, tearing pain. He has no significant past medical history. Blood pressure is 130/76 mm Hg in the right arm and 78/48 mm Hg in the left arm, radial pulse in his right arm is 98 beats per minute and regular, and respiratory rate is 20 per minute and non-labored. What condition would you most likely suspect?