Freestyle swimmer Brittany Elmslie has withdrawn from the Australian team for the world championships after undergoing surgery to a remove a benign growth in her breast three weeks ago.

Swimming Australia said in a statement Sunday that Elmslie was expected to compete in the 4x100 and 4x200 freestyle relays at Kazan, Russia from July 27 to Aug. 9.

The 20-year-old Elmslie informed Swimming Australia of her decision on Friday after discussions with her coach, Brisbane-based Michael Bohl.

Elmslie, who won a 4x100 relay gold with Australia at the 2012 London Olympics and two silver relay medals, says "I haven't been able to put in the training ... and after a lot of thought I have decided that I am best to work through my health issues here in Australia."