In the submitted case-records the authors present interesting peroperative findings – a coprolith obturing the lumen of the appendix, the torsion of an ovarian cyst and torsion of the omentum during diagnosis of acute appendicitis. The authors discuss the reliability of preoperative sonography for the diagnosis of pathological conditions in the appendical region which despite its falsely negative results are considered by the authors a useful method in the differential diagnosis of pain in the right iliac fossa.

        Key words: appendicitis – differential diagnosis