Neon Roberts had a brain tumour removed last year and his mother Sally has taken legal action to prevent him having to undergo more radiotherapy.
Ms Roberts, 37, is at the High Court trying to prevent her son from getting more of this cancer treatment.
Mr Justice Bodey may now have to make a decision on further surgery, before a ruling on radiotherapy is made.
The court has been told Neon may need more radiotherapy, but Ms Roberts has not given her consent.
The judge said a decision was of utmost urgency.
He said if Neon's parents wanted to pass the decision to him, he would adjudicate on the case.
The hearing, which is listed for two days, was adjourned.