Mass killer Anders Behring Breivik slammed a psychiatric report that declared him insane, insisting Wednesday it was based on “evil fabrications’’ meant to portray him as irrational and unintelligent.

“It is not me who is described in that report,’’ the right-wing extremist, who has admitted to killing 77 people in a July 22 bomb-and-shooting rampage, said in court.

A second psychiatric examination found that Breivik was sane. The five-judge panel trying Breivik on terror charges for the attacks will consider both reports.

Breivik’s mental state is the key issue that remains unresolved in the trial, since he has admitted to a bombing in Oslo’s government district that killed eight people and a subsequent shooting massacre at a Labor Party youth camp that left 69 people dead, most of them teenagers. He claims the attacks were “necessary’’ and that the victims had betrayed Norway by embracing immigration.

If found guilty and sane, Breivik would face 21 years in prison, though he can be held longer if deemed a danger to society. If declared insane, he would be committed to compulsory psychiatric care.

“To a political activist, the worst thing that can happen is to end up in a mental hospital,’’ Breivik said. “That would delegitimize everything you stand for.’’

Breivik showed no remorse Wednesday as he listened to testimony describing the horrific injuries of the bombing victims, declaring instead that if anyone should apologize it was the governing Labor Party.

He said he had hoped they would change Norway’s policy on immigration after his attacks.

“But instead they continue in the same direction, so the grounds for struggle are unfortunately even more relevant now than before July 22,’’ Breivik said.