Diagnosis
Magnetic resonance imaging and computed tomography are the most useful imaging tools for detecting SIS. The congestion in the brain's blood vessels may be visible using CT scans.
SIS is distinct from repetitive head injury syndrome, in which a person suffers a series of minor head injuries over time and experiences a slow decline in functions such as cognitive abilities. Unlike SIS, repetitive head injury syndrome may still occur even when symptoms from prior injuries have completely resolved. SIS is thought to be more severe than repetitive head injury syndrome in both the short- and long-term.
Read more about this topic: Second-impact Syndrome