Some concussions are more severe than others.
Simple concussions cause short losses of consciousness. Coma from lack of oxygen may last several weeks and is often fatal.
The special M.R.I. technique, known as diffusion tensor imaging, is also being studied to help improve the diagnosis of concussions.
By the Pentagon's own admission, many soldiers who likely suffered this invisible form of TBI were never screened for concussions prior to 2009-2010.
Medics steadies trays of instruments against the Bomb concussions
a mighty tremor followed by minor concussions
國文精選館
