PET scans are generally very accurate at detecting abnormalities in the body, such as cancerous tumors or areas of inflammation. However, PET scans are not perfect and there is a small possibility of false positive or false negative results. A false positive result is when the PET scan suggests that there is an abnormality present when there is actually none. A false negative result is when the PET scan fails to detect an abnormality that is actually present. The overall accuracy of a PET scan can be affected by a number of factors, including the quality of the scan, the skill of the person interpreting the images, and the type of abnormality being detected. In general, PET scans have a high level of accuracy, but they should be interpreted in the context of other diagnostic tests and the overall clinical presentation of the patient.