Cospito, 55, has been on hunger strike for five months against his tough 41 bis jail regime, normally reserved for Mafia bosses.
He has lost over 40 kg and increasing concerns over his health have helped spur anarchist protests and violent action including arson attacks in his support inside and outside Italy.
The Constitutional Court on Tuesday cleared the way for a reduction of Cospito's sentence, dropping the rule that would have bound the Turin Court of Appeal to necessarily sentence him to life imprisonment.
He was sentenced to 20 years in prison for the attack on the Carabinieri Cadet School in Fossano.
He is serving an additional 10 years for kneecapping a nuclear company executive.
ANSA
