US First Lady Melania Trump was hospitalized on Monday after undergoing surgery to treat a benign kidney condition.
The Slovenia-born wife of Donald Trump underwent an embolization procedure, said her communications director Stephanie Grisham.
"The procedure was successful and there were no complications," Grisham said.
White House officials expected Trump, 48, to remain in hospital for the rest of the week.
"The first lady looks forward to a full recovery so she can continue her work on behalf of children everywhere,” her office said.
President Trump visited her later Monday and tweeted that the procedure was "successful" and that his wife was in "good spirits."
Jeffrey Leef, associate professor of radiology at the University of Chicago, told AFP that embolization is most frequently used to isolate a tumor, cancerous or benign.
The procedure "introduces a small catheter into the arterial system of the body" with the aim of obstructing the blood vessel, Leef said.
According to Elizabeth Kavaler, a urologist at Lenox Hill Hospital in New York, the first lady may have a common, benign tumor of the kidney called an angiomyolipoma, or AML.
"They are more common in women. They can grow but they are not cancerous," Kavaler said.
She was last seen in public on Wednesday at a White House event where she and the president honored military mothers and spouses for Mother's Day.
Earlier this month, the first lady unveiled the initiative she plans to focus on during her time at the White House -- the "Be Best" awareness campaign, which she said will focus on childhood well-being, social media use and opioid abuse.
Her popularity rating has been on the rise since her husband took office more than 15 months ago.
According to a CNN/SSRS poll published a week ago, 57 percent of Americans have a favorable opinion of the first lady -- a big jump from January, when she enjoyed 47 percent support.
Her "Be Best" event in the White House Rose Garden reinforced the image of a first lady who is getting more comfortable in her role.
