First lady Melania Trump underwent a procedure to treat a benign kidney condition Monday morning, the White House said in a statement.

Trump, 48, underwent an embolization at Walter Reed National Military Medical Center. The minimally invasive procedure involves injecting tiny pieces of a special material through a catheter into one or more kidney vessels to cut off part of the blood supply.

"The procedure was successful, and there were no complications," her office said.

Thomas Jefferson University nephrology chief Jerry McCauley.
Thomas Jefferson University
Thomas Jefferson University nephrology chief Jerry McCauley.

Jerry McCauley, chief of nephrology at Thomas Jefferson University, said two relatively common kidney conditions can be diagnosed with imaging and treated with embolization: a vascular malformation or a benign mass called angiomyolipoma.

Without treatment, vascular malformations can bleed abruptly and become life-threatening, while angiomyolipomas can grow, causing pain and bleeding, explained McCauley, who is not involved in the first lady's medical care.

Embolization generally has little or no effect on the kidney function of otherwise healthy people, he said.

The first lady was last seen in public with her husband on Thursday when they greeted three Americans who were released from North Korea. The president, who remained at the White House during the procedure, tweeted that he was going to visit her around 5 p.m.

A week ago, she unveiled her formal platform, Be Best, focused on opioid addiction and two other initiatives.

Her office said she would likely remain at Walter Reed "for the duration of the week."

McCauley said most patients go home within a couple of days from an embolization, "but maybe there is an abundance of caution with the first lady."