The family of the youngest person in Australia to receive gender-realignment treatment is appealing for the right to complete the process.
The case could see a precedent set that sex-change treatments for young people should be decided by families and doctors rather than the courts, the Herald Sun reports.
The child involved in this case, "Jamie", 11, was diagnosed with gender identity disorder.
Her parents say she first identified as a girl at three years old and she wears girls' clothing and uses the girls' toilets at school.
The Family Court last year ruled that Jamie could have drug therapy to stop her going through male puberty but refused to allow further oestrogen treatment.
Her family are now appealing for that ruling to be overturned on the grounds that sex-change treatments should not fall under special medical procedures that courts must approve.
The Full Court of the Family Court says the case to be heard next month could set a precedent.
"The appeal raises the possibility of a significant change in the law as it now stands and the overturning of many cases," the court said.
The Australian Coalition for Equality's Martine Delaney said she could not see why the court had to be involved.
But the Victorian president of the Australian Family Association, Terri Kelleher, said it was a "fraught area" that should be overseen.