Privacy experts cringed when people started feeding their medical images to the A.I. tool Grok.

Over the past few weeks, users on X have been submitting X-rays, MRIs, CT scans and other medical images to Grok, the platform’s artificial intelligence chatbot, asking for diagnoses. The reason: Elon Musk, X’s owner, suggested it.

“This is still early stage, but it is already quite accurate and will become extremely good,” Musk said in a post. The hope is that if enough users feed the A.I. their scans, it will eventually get good at interpreting them accurately. Patients could get faster results without waiting for a portal message, or use Grok as a second opinion.

Some users have shared Grok’s misses, like a broken clavicle that was misindentified as a dislocated shoulder. Others praised it: “Had it check out my brain tumor, not bad at all,” one user wrote alongside a brain scan. Some doctors have even played along, curious to test whether a chatbot could confirm their own findings.

Although there’s been no similar public callout from Google’s Gemini or OpenAI’s ChatGPT, people can submit medical images to those tools, too.

The decision to share information as sensitive as your colonoscopy results with an A.I. chatbot has alarmed some medical privacy experts.

“This is very personal information, and you don’t exactly know what Grok is going to do with it,” said Bradley Malin, a professor of biomedical informatics at Vanderbilt University who has studied machine learning in health care.

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