Researchers are presenting with a malware that not only modifies CT scan results, it also does them with such realism that it manages to fool professionals into misdiagnosing the presence or absence of cancer.
A blind study that involved 70 altered CT lung scans showed proved that both radiologists and a lung-cancer screening software were consistently duped into thinking there were cancerous nodes in a scan when the original actually had none. Conversely, scans that removed actually existing nodes were similarly diagnosed as healthy. Even when informed that the images were altered, doctors still had a high rate of making a false diagnosis.
Source: Slashgear