Acute appendicitis is inflammation of the appendix. It is a very common condition in general radiological practice and is one of the main reasons for emergency surgery in younger patients. It is important to make the diagnosis in time to avoid life-threatening complications. Radiological imaging methods play a key role in the diagnosis of acute appendicitis since they increase diagnostic accuracy and contribute to differential diagnosis, assessment of complications and preoperative planning. The most commonly used modalities are ultrasound, computed tomography and magnetic resonance. These three modalities provide a detailed view of the anatomy of the worm, indicate thickening of the wall and signs of inflammation, show the vascularization of the intestine and provide insight into the development of possible complications. The first method of choice is ultrasound due to its safety and availability. Acute appendicitis appears on US as an aperistaltic tubular structure with a diameter greater than 6 mm. CT has greater sensitivity and specificity than ultrasound, but is not recommended as the first method of choice due to the use of ionizing radiation. Magnetic resonance imaging is a good substitute for computed tomography due to similar sensitivity and specificity. MRI does not use ionizing radiation, however, it can increase the time of diagnosis and is not an easily available method and is mainly used to diagnose acute appendicitis in pregnancy.