What a Brain Injury Looks Like in Medical-Legal Cases: A Neurologist Expert Witness Perspective
By Dr. Claudia Muñoz, MD, MPH — Board-Certified Neurologist & Epileptologist, Medical Expert Witness
In a medical-legal case, a traumatic brain injury (TBI) is rarely a single finding on a scan. It is a pattern built from several kinds of evidence: what the patient reports, what the exam shows, what testing measures, and what the records document over time. As a neurologist who evaluates these cases for both plaintiff and defense counsel, I look at how well those pieces fit together.
Patient Reports
Symptoms are usually where a TBI becomes visible. They tend to fall into three groups:
Cognitive: trouble with memory, concentration, and processing speed
Physical: headaches, dizziness, balance problems, fatigue, sensitivity to light or noise
Emotional and behavioral: irritability, anxiety, low mood, sleep disturbance
Many of these symptoms are common in other conditions too, which is why the timeline and context matter as much as the list itself.
Neurological Exam Shows
After a mild TBI, the neurological exam is often normal or near normal. That doesn't rule out an injury, and it doesn't confirm one. When abnormalities are present, they may involve balance, coordination, eye movements, or performance on cognitive screening tasks. The exam is most useful when read alongside the history and the testing.
What Imaging Can and Cannot Show
CT and MRI are designed to find structural problems such as bleeding, swelling, and contusions. In moderate and severe TBI, they often show clear abnormalities. In mild TBI, they are frequently normal, because the injury is largely functional rather than structural.
A normal scan therefore does not exclude a mild TBI. Equally, imaging alone cannot establish how a person is functioning. Some advanced imaging techniques are being studied for subtle injury, but they are not yet routine clinical tools in most settings.
What Neuropsychological Testing Adds
Neuropsychological testing measures attention, memory, processing speed, and executive function, and compares the results with expected norms for the person's age and education. It can document deficits that the exam and imaging cannot.
It has limits too. Results can be affected by sleep, pain, mood, medication, and effort, so well-designed evaluations include measures of the consistency and validity of the person's performance. Testing supports a diagnosis. It does not make one on its own.
What the Records Should Show
The medical record often decides how persuasive the picture is. I look for:
Mechanism of injury: what happened, and whether it is consistent with a brain injury
First presentation: what was reported and documented in the first hours and days
Symptom timeline: when symptoms began, and whether they resolved, persisted, or changed
Prior history: earlier head injuries, migraine, sleep disorders, or mood conditions that could account for some symptoms
Consistency: whether reports, exam findings, and testing point in the same direction
What This Means for Case Evaluation
No single finding settles the question. A diagnosis rests on the whole picture, not on one scan or one test.
A normal scan is not the end of the analysis, and an abnormal one is not either. Imaging has to be read with the clinical findings.
Consistency carries weight in both directions. When the mechanism, symptoms, exam, and testing line up, that supports the injury. When they don't, that matters too.
Pre-existing conditions need careful sorting. Separating prior symptoms from new ones is part of a credible opinion.
Each case depends on its specific facts and medical history. This article describes general clinical patterns, not an opinion on any specific case.
Work With a Neurologist Expert Witness
If you are evaluating a TBI case, a thorough neurological review of the records, exam, and testing can clarify what the evidence does and does not show.
I provide independent medical examinations, medical record review, expert report writing, and deposition and trial testimony for plaintiff and defense attorneys handling traumatic brain injury cases.
📩 doctor.claudia@gmail.com | info@drclaudiamunoz.com
Dr. Claudia Muñoz, MD, MPH Neurologist | Epileptologist | Medical Expert Witness
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