Browse evidence-based analysis of health-related claims and assertions
A special type of full-body MRI scan found cancer in 2.2% of healthy or slightly symptomatic adults between 35 and 79, and even more often in people over 65 — suggesting it might catch cancers that regular screenings usually miss.
Descriptive
Doctors are testing a full-body scan that can find many types of cancer at once, and they’re using it on both people who pay for it themselves and those who get it for free, to see if rich and poor people are being detected differently.
Using a full-body MRI scan to look for cancer early might help find cancer sooner and at an earlier stage, which lets doctors better understand how people get diagnosed over time.
Correlational
Using a full-body MRI scan to check for cancer and other serious health problems might help doctors find them more accurately, based on how often it correctly identifies or rules out disease.
Using a special full-body MRI scan and a new way to sort results, doctors can find serious health problems that aren't cancer—like heart or liver issues—that need quick follow-up.
Using a full-body MRI scan to check for hidden health problems has been linked to finding cancers and other serious conditions in real patients, and doctors use special scoring systems to decide who needs more tests.
When doctors scan healthy people’s whole bodies with MRI, they find cancer in about 1 out of every 80 people—but almost a quarter of those with suspicious findings never get follow-up tests, so we might be missing even more cancers than we think.
Two expert radiologists using the ONCO-RADS system to rate MRI scans agreed on the cancer risk level in nearly all cases — showing the system is consistent and not just based on personal opinion.
Quantitative
When healthy adults without symptoms get a full-body MRI scan, about 1 in 100 are found to have early-stage cancer—like in the lungs, kidneys, or prostate—and catching it this early might help treat it better.
If you're an adult with no symptoms, being older, having high blood pressure, carrying hepatitis B, or having had surgery before might mean your full-body MRI shows more suspicious findings that could need further checking.
When healthy adults get a full-body MRI scan, those flagged with higher ONCO-RADS scores (4 or 5) are much more likely to actually have cancer—about 4 in 10 for score 4 and 3 in 4 for score 5.
Doctors might be able to use a full-body MRI scan as the first test to find cancer in kids, because one study showed it was good at spotting cancer and not giving false alarms — but this was only done in one hospital.
If a child gets a whole-body MRI and it comes back negative, there’s a 99.1% chance they don’t have cancer — so doctors can be very confident the child is cancer-free based on this scan.
A special kind of full-body scan called MRI with a specific setting (STIR) can find cancer in kids with very high accuracy—correctly spotting it in almost all cases where it’s there and correctly saying it’s not there when it isn’t.
We don’t have enough solid proof yet to say that scanning the whole body with MRI helps healthy people find problems early or saves money.
Getting a full-body MRI scan if you're not at high risk for disease might find things that aren't actually problems, leading to more tests and stress — and no one has yet measured how often this happens.
Some people think that getting a full-body MRI scan might help find several health problems at once and save you from having to do lots of separate tests — but this hasn’t been proven yet.
Using whole-body MRI to check healthy people without any symptoms isn't like regular screenings because it's unlikely to find serious problems, and many diseases just can't be seen well with this scan.
Companies are selling full-body MRI scans to healthy people who feel fine, but doctors don’t agree that these scans actually help or are worth the cost.
Using whole-body MRI to scan healthy people without symptoms for hidden cancers isn't very useful because it rarely finds cancer, finds lots of harmless bumps that cause worry, isn't done the same way everywhere, and we don't know if it actually helps people live longer.
Doctors use full-body MRI scans to look for cancer in people who feel fine, but since everyone uses different scan settings, results can vary a lot — making it hard to trust or use these scans widely.
When doctors scan the whole body with an MRI in people who feel fine and have no reason to think they have cancer, they find cancer in about 1.57 out of every 100 people.
Scanning your whole body with an MRI might help find hidden cancers in people who feel fine, but doctors don’t recommend it yet because we don’t have enough proof it works well enough for everyone.
We don’t know yet if scanning the whole body with MRI helps healthy people live longer or save money over time when checking for cancer.