Table 1.

Neurological sequelae of sport-related head trauma

	Onset and progression	Type of trauma
Post-concussion syndrome	Acute/subacute onset (usually resolved within 10 days)	Isolated head trauma (usually mild to moderate)
Persistent post-concussion syndrome	Acute/subacute onset (persisting more than 30 days, possibly reversible)	Isolated head trauma (usually moderate to severe)
Chronic post-concussion syndrome	Acute/subacute onset (persisting more than 1 year, unlikely reversible)	Isolated head trauma (usually moderate to severe)*
Post-traumatic dementia or parkinsonism **	Acute/subacute onset (irreversible)	Isolated head trauma (usually moderate to severe)*
Chronic traumatic encephalopathy (CTE)	Insidious onset and progressive course	Repetitive concussive and sub-concussive blows

*Athletes may have a history of previous multiple TBI

**Other neurological sequelae, such as motor symptoms, are possible

TBI: Traumatic Brain Injury