CASE 5 History: A 74-year-old woman presents with left lower quadrant abdominal pain for several days. 1. Which of the following should be included in the differential diagnosis for this patient? (Choose all that apply.) 2. The referring clinician requests further imaging to assist with preoperative planning. Which study is most appropriate? A. Abdominal and pelvic ultrasound D. Drainage: CT guided aspiration 3. Which of the following regarding colonic diverticular disease is true? A. Colonic diverticula are true diverticula. B. Diverticulitis is the most common cause of colovesical fistula. C. Diverticular hemorrhage usually ensues if diverticulitis is left untreated.