Q. A 60-year-old man presents to the primary care clinic complaining of abdominal pain and fever for the past 2 days. The pain is primarily located in the lower left quadrant and he describes it as a constant, dull ache. He also has a change in bowel habits and has been experiencing constipation for the past week. His dietary history includes a high-fat, low-fiber diet. His medical history shows hypertension and diabetes, for which he is on regular treatment. He is a non-smoker and non-alcoholic. His temperature is 101°F (38.3°C), pulse 90 beats per minute, blood pressure 130/80 mmHg, and respiratory rate 14 breaths per minute. His BMI is 32 kg/m2. Physical examination shows tenderness in the left lower abdominal quadrant without any organomegaly. What is the best next step in his management?