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- A 63-year-old man was having a routine colonoscopy when doctors saw a fly in his intestines.
- Doctors said it was a "mystery" how the fly had gotten in there and remained intact.
- Insects can enter the intestines if food containing insect eggs or larvae is consumed.
Doctors in Missouri were baffled to spot a fly inside a man's intestines during a routine colon screening.
Images taken during the colonoscopy and published in the American Journal of Gastroenterology show the intact fly inside the man's colon.