Visual Abstract (IMAGE) American College of Surgeons Caption Results from a new large-scale study show that in nearly 20 percent of patients, papillary thyroid tumors less than 1 cm in size had pathological signs of more aggressive disease that increased the risk that these patients might develop distant metastasis. Credit American College of Surgeons Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.