Enlarge / Dislocated cervical vertebrae (traumatic lesion of cervical vertebrae C1-C2). X-ray in profile. (Photo by: BSIP/Universal Images Group via Getty Images) (credit: BSIP | GettyImages) ProPublica is a Pulitzer Prize-winning investigative newsroom. Sign up for The Big Story newsletter to receive stories like this one in your inbox. Medical images and health data belonging to millions of Americans, including X-rays, MRIs, and CT scans, are sitting unprotected on the Internet and available to anyone with basic computer expertise. The records cover more than 5 million patients in the United States and millions more around the world.