Ultrasonography and computed tomography in patients with right lower quadrant pain: Difficult cases of appendicitis

Acute appendicitis is a common cause of acute abdomen and both computed tomography (CT) and ultrasonography (US) are used in the diagnostic work-up of these patients. In general, imaging has high accuracy in diagnosing acute appendicitis. Although the imaging features of appendicitis are well known, in some patients fi ndings are less conclusive. This pictorial essay will give an overview of diffi cult US and CT cases of patients suspected of acute appendicitis.