The doctors thought they were removing a tumor form the newborn’s brain. To their surprise, they found something completely different: an entire tiny foot and parts of another foot, hand and thigh.

According to the BBC, doctors at Memorial Springs Hospital for Children in Colorado Springs, CO, made this discovery while operating on 3-day old Sam Esquibel in October.

Experts believe this is a case of “foetus in foetu,” where a twin forms inside its sibling — though this rarely occurs inside the brain.

Sam is now fine and recovering, with only a small scar as evidence of what happened. It may be years, though, before he can tell us if he keeps hearing footsteps…

Note: image is a stock photo, so don’t freak out.

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