CASE 2 History: A 42-year-old man presents with acute abdomen and right lower quadrant pain and tenderness. 1. What is the best diagnosis for this patient based on the imaging? 2. Which choice best characterizes the calcific density? 3. Which of the following statements about imaging of acute appendicitis is true? B. An appendicolith is visible on plain radiography in 20% to 25% of cases.