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The fetus Adkins was carrying also had fluid buildup, signaling a potentially fatal condition called hydrops.

In its most severe form, it results in a condition known as hydrops fetalis, characterized by a fatal accumulation of fluid in the body.

The 29-year-old pulled out of last month's British Championships after suffering whiplash at the Birmingham Diamond League meeting, which has since caused a severe ear disorder called cochlear hydrops.

Dangerous amounts of fluid buildup in the fetus caused swelling and damage to different parts of its body, a condition called hydrops fetalis, said the researchers, from Brazil and Yale University.

“Dr. Wheeler had studied two or three cases of hydrops fetalis during his residency in Houston, so he knew what he was getting into,” she added.