The word "mild" in "mild traumatic brain injury" describes the acute clinical presentation — the Glasgow Coma Scale on arrival, the length of unconsciousness, the duration of confusion. It does not describe the long-term outcome. A meaningful minority of patients with a clinically mild TBI never fully recover, and that fact has been documented in the medical literature for forty years. This post is about why — and what it means for a case.
The most damaging word in a brain injury chart is "mild." It is a clinical classification that exists for emergency medicine triage purposes. It does not describe what the patient looks like in three months, or three years, or for the rest of their life. By the time the case reaches a defense lawyer's desk, however, "mild" has become an argument: the medicine called this mild, so the harm must be mild, so the case must be mild.
The job of the plaintiff team is to separate the classification from the prognosis and to put the actual outcome in front of the jury.
The Glasgow Coma Scale (GCS) was developed in 1974 to standardize the assessment of consciousness after head injury. It measures three things: eye opening, verbal response, and motor response. The score ranges from 3 (deep coma) to 15 (fully alert). The Department of Defense and the Centers for Disease Control and Prevention have adopted a severity framework that classifies TBI as:
Roughly three out of four traumatic brain injuries fall into the "mild" category. The label is a function of what the patient looked like in the trauma bay. It says nothing about the underlying tissue damage at the cellular level, and it says nothing about how the brain will function six months later.
The medical literature has, for decades, recognized a subset of mild TBI patients who do not follow the expected recovery curve. The CDC's clinical guidelines acknowledge that while most patients return to baseline within weeks, a meaningful percentage develop persistent symptoms lasting three months or longer. Published estimates of that group commonly fall in the 10 to 20 percent range, with a smaller subgroup experiencing permanent deficits. The Department of Defense has published on the same phenomenon in the active-duty population.
The persistent post-concussive symptoms documented in this literature include:
None of those symptoms are visible in a photograph. None of them show up on a video deposition. All of them are real, and all of them are documented in the peer-reviewed literature.
A standard head CT in a mild TBI patient is, by definition, usually normal. That is part of the diagnostic profile. The damage in mild TBI happens at the cellular level — stretched axons, microtears in white matter tracts, disrupted neurotransmitter signaling — that conventional CT cannot resolve. The findings the firm looks for on follow-up imaging are:
For the cases where every advanced sequence comes back negative — and there are such cases — the diagnosis still stands, because the diagnosis of mild TBI is clinical, not radiographic. The medical record establishes the mechanism, the symptom onset, the temporal progression, and the absence of an alternative explanation. The litigation evidence then comes from neuropsychological testing.
A formal neuropsychological evaluation is the single most valuable piece of evidence in most mild TBI cases. A licensed neuropsychologist administers a battery of standardized tests measuring attention, processing speed, memory, executive function, language, and visuospatial skills. The results are compared against age-, education-, and demographic-matched norms. Effort-validity measures embedded in the battery rule out malingering or symptom exaggeration.
When a patient's neuropsych battery shows objective deficits across the expected cognitive domains, with valid effort scores, and the deficits correlate with the mechanism of injury and the symptom trajectory — that is the evidence the jury can see. It converts a "soft" injury into a documented impairment with quantifiable severity. The Alvarez Law Firm refers every catastrophic mild TBI client for neuropsych testing as part of the workup, regardless of what defense argues about the diagnosis.
The jury needs to see who the person was before the injury and who they are now. The first set of records the firm pulls is not medical — it is the pre-injury work history, the school transcripts, the prior performance reviews, the photographs of the person doing the activities they no longer do. A "mild" TBI is mild only relative to the population. It is rarely mild relative to the specific person who had to stop teaching, stop writing, stop running their own business, stop being a present parent.
Witnesses who knew the person before are often the most powerful trial evidence. A spouse, a child, a coworker, a sibling. The neuropsychologist provides the data. The lay witnesses provide the texture. Together they show the jury the gap between the GCS of 15 on the EMS report and the human being sitting in the courtroom three years later.
If you or someone you love had what the ER called a "mild" concussion and the symptoms are still there months later, three things matter. First, follow up with a neurologist or a physiatrist who specializes in concussion, not just the primary care doctor. Second, ask for the MRI with susceptibility-weighted imaging if it has not been ordered. Third, before any insurance carrier offers an early settlement, get the case in front of an attorney who has actually tried a mild TBI to verdict. The word "mild" is the defense's argument. The medicine and the testing are the answer.
There is no clinical difference. The terms are used interchangeably in medical literature. A concussion is a mild traumatic brain injury — defined by a Glasgow Coma Scale of 13–15, loss of consciousness (if any) under 30 minutes, and post-traumatic amnesia under 24 hours. The word "concussion" tends to be used in sports medicine and primary care; "mild TBI" tends to be used in emergency medicine and litigation.
Most patients recover within two to four weeks. A meaningful minority — published estimates commonly fall in the 10 to 20 percent range — develop persistent post-concussive symptoms lasting three months or longer. A smaller group experiences permanent cognitive, emotional, or vocational deficits. The CDC and Department of Defense have both acknowledged this "miserable minority" in published guidance.
A standard ER head CT is usually normal in mild TBI. That is part of the diagnostic definition. More sensitive imaging — MRI with susceptibility-weighted imaging, diffusion tensor imaging — can detect microbleeds, white matter injury, and other findings in a meaningful percentage of patients. Neuropsychological testing, performed by a licensed neuropsychologist, is the most reliable way to document the cognitive impact of a mild TBI for litigation purposes.
Two reasons. The word "mild" invites the inference that the injury is minor. And the lack of dramatic acute findings — no surgery, no ICU, no visible deficit — makes the injury look like one that should have resolved. Both inferences are wrong. The medical literature has documented the persistent and permanent harm a mild TBI can cause for decades. The litigation strategy on the defense side is to ignore the literature and to ask the jury to trust the word "mild." The plaintiff strategy is to put the literature, the imaging, and the neuropsych testing in front of the jury.
The full case-type overview on TBI litigation.
Why a normal CT does not mean a normal brain.
What to preserve immediately after a head injury.
The leading mechanism of TBI in the United States.
Concussion is a common rideshare-passenger injury.
Even a "minor" fall can produce a mild TBI with lasting consequences.
If you are living with the aftermath of a "mild" concussion that was supposed to resolve and did not, we will personally review the medical record. Herb Borroto, M.D., J.D., reads the imaging. Alex Alvarez evaluates the case. Free, confidential.
