Machine Learning Model (IMAGE) Johns Hopkins Medicine Caption A microscopic image of intramedullary osteosarcoma. Johns Hopkins researchers have trained a machine learning model use such images to calculate percent necrosis — or, what percentage of a tumor is “dead” and no longer active — in patients with intramedullary osteosarcoma. Credit Johns Hopkins Medicine Usage Restrictions N?A License Original 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.