Which of the following is NOT a key assessment finding for appendicitis?

Hewitt's sign is not recognized as a key assessment finding in the diagnosis of appendicitis. In the clinical evaluation of appendicitis, psoas sign indicates irritation of the iliopsoas muscle which can occur when the inflamed appendix is in close proximity. Rovsing's sign involves pain felt in the right lower quadrant when the left side of the abdomen is palpated, indicating appendiceal inflammation. McBurney's point tenderness is a classic finding directly associated with appendicitis, where pain is localized typically two-thirds of the way from the umbilicus to the right anterior superior iliac spine. These established clinical signs are essential in reaching an accurate diagnosis of appendicitis, while Hewitt's sign does not play a recognized role in this condition's assessment.