Fig. 6. Acute appendicitis in a 31-year-old man.

A. Sonographic image of the right lower quadrant displays an enlarged appendix along its long axis (black arrows), with preserved stratification. Hyperechoic periappendiceal inflammatory tissue (asterisks) and intraluminal appendicolith (white arrow) are also evident. B. A color Doppler sonographic image through the short axis of the appendix confirms its enlargement (black arrows) and shows mural hyperemia (white arrows). Note the concomitant presence of periappendiceal fluid (white asterisks) and hyperechogenic changes in the periappendiceal fat, indicative of inflammation (black asterisks). C. A laparoscopic image confirms the presence of a dilated appendix (black arrows) with wall hyperemia (white arrows).