Attorneys representing dozens of former NFL players in the nationwide concussion litigation argued in a federal appeals court Thursday that the league’s $1 billion settlement left certain players suffering from brain trauma without compensation.

The roughly 90 players on appeal took issue with the settlement—reached in April after extended debate—because it didn’t include payment for players diagnosed with chronic traumatic encephalopathy (CTE) after the presiding judge’s settlement approval date. CTE is a degenerative neural disease associated with repeated blows to the head. It was historically referred to as dementia pugilistica, or the state of being “punch drunk.”