US President Donald Trump's wife, Melania, underwent a surgical procedure to treat a benign kidney condition and will remain at Walter Reed medical center for the rest of the week, the first lady's office said.

Spokeswoman Stephanie Grisham said in a statement that Mrs Trump, 48, underwent an embolisation procedure to treat the kidney condition.

"The procedure was successful and there were no complications," Ms Grisham said.

"The first lady looks forward to a full recovery so she can continue her work on behalf of children everywhere."

Mr Trump spoke with his wife of 13 years before the procedure and talked to the doctor after it was completed, a White House official said.

Mr Trump later traveled by his Marine One helicopter to Walter Reed to visit his wife.

"Heading over to Walter Reed Medical Center to see our great First Lady, Melania. Successful procedure, she is in good spirits. Thank you to all of the well-wishers!" he tweeted.

An embolisation is a minimally invasive procedure often used to block the flow of blood to a tumor or an abnormal area of tissue.

Dr Keith Kowalczyk, a urologist at MedStar Georgetown University Hospital, said that based on available information it appeared that Ms Trump was treated for a benign tumor known as an angiomyolipoma.

"It's the most common benign tumor that's out there. It is a tumor, which means it's a growth. There's no worry for it to spread or metastasize. Once it's treated, it's treated," he said.

Dr Kowalczyk said women in their mid to late 40s make up 80 to 90% of the cases of angiomyolipomas.

"It kind of all fits. But I don't know. Any time you are doing an embolisation, it's because something might bleed. She's young and healthy and I can't really think of any other reason you would embolise someone like that."

Dr Kowalczyk said angiomyolipomas are most commonly found by chance.

"Usually, with embolisation there is over a 90% success rate," he said.

The Slovenian-born first lady last week rolled out an agenda for her White House work focused on helping children.