Traumatic Encephalopathy: The injury is not the blow—it is the breach and inflammation that lingers

A striking study in Science Translational Medicine reveals that the blood–brain barrier remains disrupted years after retirement in contact-sport athletes. This persistent leakiness is linked to systemic inflammation, complement activation, and measurable cognitive decline.   Notably, imaging of BBB dysfunction outperformed conventional blood biomarkers—offering a potential path toward early detection of CTE risk in living individuals.   The key insight: it's not single concussions, but the cumulative burden of head trauma that shapes long-term brain health.