A clinical diagnosis of acute appendicitis Versus right ureteric colic was made by the emergency department physician and a plain CT pyelogram was requested, which was negative for any ureteric calculus or hydroureteronephrosis. However, the CT scan was positive for acute appendicitis. In addition, the CT scan also showed a partially calcified small bowel related mass lesion in the left iliac fossa which was thought to be a leiomyoma or gastrointestinal stromal tumor (GIST).