We retrospectively identified all mild TBI patients (Glasgow Coma Scale score ≥13) who presented to a Level I trauma center over a 10-year period. We compared isolated tSAH patients with isolated concussion patients. χ(2) and logistic regression analyses were used to compare intensive care unit (ICU) admission, ICU length of stay (LOS), hospital LOS, progression of tSAH, in-hospital mortality, and disposition to rehabilitation.