Fetus in fetu

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Notion

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Science and technology

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What Wikipedia says

Fetus in fetu (or foetus in foetu) is a rare developmental abnormality in which a mass of tissue resembling a fetus forms inside the body of a true fetus. An early example of the phenomenon was described in 1808 by George William Young.

Excerpt from the Wikipedia article “Fetus in fetu”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Nisreen M Khalifa et al, CC BY 2.0, via Wikimedia Commons.