A 49-year-old man presents to the office complaining of vague abdominal discomfort over the past few days. He states he does not feel like eating and has not moved his bowels for the last 2 days. His patient medical history includes an appendectomy at age 22 and borderline hypertension, which he is trying to control with diet and exercise. He takes no medications and has no known allergies. Positive physical exam findings include a temperature of 99.9 degrees Fahrenheit, heart rate of 98, respiratory rate of 24, and blood pressure of 150/72. The abdominal exam reveals abdominal distention, diminished bowel sounds, and lower left quadrant tenderness without rebound.