LOS ANGELES — US lawmaker Gabrielle Giffords, who was almost killed in a horrific shooting in January, is recovering well after an operation to replace part of her skull, doctors said.

The Arizona lawmaker underwent a cranioplasty to replace the part of her cranium removed to allow space for her brain to swell, after she was shot in the head at point-blank range.

"The Congresswoman is recovering well after her surgery today," said the Memorial Hermann-Texas Medical Center in Houston in a statement, adding that it would give further details at a press conference on Thursday.

Giffords has been undergoing rehabilitation to regain movement on the right side of her body after a bullet tore through the left side of her brain in a shooting rampage in Tucson, Arizona on January 8.

Six people were killed, including a federal judge and a 9-year-old girl, when a gunman opened fire at a political meeting Giffords was holding with constituents outside a grocery store.