This Sept. 26, 2010, file photo shows Serena Williams arriving at "Macy's Passport Presents Glamorama" event in Los Angeles. People magazine is reporting that Williams has undergone surgery for a pulmonary embolism. Spokeswoman Nicole Chabot tells the magazine that the blood clot in Williams' lungs was discovered last week, and that she had "emergency treatment (Monday) for a hematoma she suffered as a result" of that treatment. Williams is being treated at a Los Angeles hospital. (AP Photo/Chris Pizzello, File)
NEW YORK — Tennis star Serena Williams underwent "emergency treatment" Monday, days after doctors discovered a blood clot in her lungs, People magazine reported.
Spokeswoman Nicole Chabot told the magazine that Williams "underwent emergency treatment for a hematoma suffered as a result of treatment for a more critical situation."
Williams suffered from a pulmonary embolism last week, Chabot said. The 29-year-old Williams is being treated at a Los Angeles hospital.
"Doctors are continuing to monitor her situation closely to avoid additional complications," Chabot told the magazine.
The winner of 13 Grand Slam titles, Williams attended Sunday night's Elton John AIDS Foundation Academy Awards Viewing Party.
On Tuesday night, Williams posted on her Twitter account "Tough day." A few minutes later she retweeted Kim Kardashian.
Williams has been sidelined by two operations on her right foot after getting cut by glass at a restaurant, and has not played a competitive match since winning Wimbledon on July 3.
Chabot also told the magazine that the embolism was discovered after she returned to Los Angeles from New York "for doctor appointments for the ongoing issues with her foot."
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