Her office said surgeons had performed an embolisation procedure on her at the Walter Reed National Military Medical Center yesterday.
A statement was put out by the White House said, "This morning, First Lady Melania Trump underwent an embolisation procedure to treat a benign kidney condition."
"The surgery was successful and there were no complications," it said.
Embolisation is most often used to block the blood supply to a tumour, benign or cancerous.
"Successful procedure, she is in good spirits. Thank you to all of the well-wishers!," he tweeted.
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