But colonoscopy doesn't expose anyone to radiation (it has other risks, of course), and mammography is lower dose X-rays compared to CT scans for lung cancer screening. If repeated CT scans are expected to cause 5% of all cancers if we don't make a change (https://cancer.ucsf.edu/news/2025/04/15/popular-ct-scans-could-account-for-5-of-all-cancer-cases-a-year), how does the number needed to screen compare to the number needed to harm?
(Sorry - the article you linked to was paywalled.)
Jennifer Hamilton, MD PhD
npub1wv…39krz
2025-11-25 13:00:35 UTC
in reply to nevent1q…d4l9
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"content": "But colonoscopy doesn't expose anyone to radiation (it has other risks, of course), and mammography is lower dose X-rays compared to CT scans for lung cancer screening. If repeated CT scans are expected to cause 5% of all cancers if we don't make a change (https://cancer.ucsf.edu/news/2025/04/15/popular-ct-scans-could-account-for-5-of-all-cancer-cases-a-year), how does the number needed to screen compare to the number needed to harm? \n(Sorry - the article you linked to was paywalled.)",
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