What clinical finding is classic for acute appendicitis?

McBurney’s point tenderness is a classic clinical finding in acute appendicitis. This point is located in the right lower quadrant of the abdomen, approximately one-third of the distance from the anterior superior iliac spine to the umbilicus. When an examiner applies pressure to this area, a patient with appendicitis typically experiences localized pain. This finding is significant because it indicates irritation of the peritoneum overlying the inflamed appendix, making it a reliable indicator of the condition.

Rebound tenderness is a valuable physical exam finding but is not specific to appendicitis; it can occur in various conditions causing peritoneal irritation. Murphy's sign primarily indicates gallbladder inflammation or cholecystitis and does not relate to appendicitis. Similarly, a positive psoas sign suggests retrocecal appendicitis or hip irritation, but it is less specific than McBurney's point tenderness.