A surgeon told ITV News Granada that Gaby Scanlon has undergone a "very big operation" but she should still be able to live a "relatively normal life".
The 18-year-old, who had her stomach removed after drinking a cocktail containing liquid nitrogen, will need to eat smaller meals more frequently and possibly take nutritional supplements, the surgeon said.
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The Prime Minister has praised the former soldier's "huge professionalism" in trying to save the life of Pc Keith Palmer.
The man who carried out the Westminster attack is thought to be British born and was once investigated by MI5, the Prime Minister has said.
Jason Day, who lost his father to stomach cancer at the age of 12, broke down in tears as he explained his shock exit during the WGC event.