A refugee on Nauru with a growing lump in her breast has had a medical transfer flight cancelled.
Refugee advocates say the woman was one of 18 on Nauru scheduled to fly to Port Moresby in Papua New Guinea for treatment on Tuesday.
But the flight was cancelled on Tuesday morning and they were told there wouldn't be another flight for at least three weeks.
Doctors for Refugees say the 39-year-old Lebanese mother-of-four has required urgent treatment for the growing lump for more than a year.
She did not want to have the biopsy done in Nauru but was willing to travel to PNG.
Doctors for Refugees convenor Barri Phatarfod said it was a "complete untruth" that people in offshore detention were receiving medical treatment comparable to that in Australia.
