When conducting a physical examination, the nurse is assessing a client's abdomen and identifies a centrally localized distention that is pulsating. This finding should direct the nurse to consider which pathology?

A. Tympany refers to a hollow, drum-like sound heard on percussion, indicating air in the abdomen but not a pulsating mass. B. A pulsating, centrally localized abdominal distention is most concerning for an abdominal aortic aneurysm (AAA), which can be life-threatening if it ruptures. C. Hernia typically presents as a bulging mass but does not usually cause pulsation. D. Appendicitis usually causes localized pain in the right lower quadrant, not pulsating distention.