US President Donald Trump has told reporters he underwent an MRI but did not say why. Photo: AP PHOTO

US President Donald Trump says he has undergone an MRI examination, without saying why.

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"It was perfect," he told reporters on board Air Force One en route to Tokyo on Monday.

A magnetic resonance imaging scan uses magnets and radio waves to create detailed images of the inside of the body.

It can be used to monitor a range of conditions.

Donald Trump's doctor said in October an examination found him to be in "exceptional health". (AP PHOTO)

Trump, 79, was the oldest person to b

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