A normal CT scan does not mean there is no brain injury. That fact sits at the center of every mild traumatic brain injury case, and it is also the point insurers work hardest to obscure. Standard emergency imaging was designed to find bleeding and fractures, not the microscopic axonal damage that produces most mild TBI symptoms. This article walks through how these cases are actually proven in California, what the imaging shows and does not show, and what the deadlines require.
What “Mild” Actually Means, and Why the Word Misleads
The label “mild traumatic brain injury” is a medical grading, not a description of a person’s daily life after the injury. The widely used American Congress of Rehabilitation Medicine definition includes any traumatic disruption of brain function marked by loss of consciousness under 30 minutes, altered mental state at the time of injury, post-traumatic amnesia under 24 hours, or a Glasgow Coma Scale score of 13 to 15 after resuscitation. Even a concussion meets that definition, and a person can suffer one with no visible bruising and no hospital admission, only to develop cognitive symptoms that persist for months or years.
South Orange County produces these injuries at a steady rate. The Interstate 5 corridor between Lake Forest and San Clemente carries stop-and-start commuter traffic that generates rear-end collisions almost daily. Pacific Coast Highway through Dana Point and Laguna Beach adds distracted tourists to the same mix. Many injured drivers are evaluated at Providence Mission Hospital in Mission Viejo, the only verified adult and pediatric Level II Trauma Center in South Orange County. The trauma team’s job on arrival is to rule out life-threatening bleeds and fractures, which they do very well. It is not to catch the diffuse axonal injury that produces the mild TBI a plaintiff’s attorney has to prove months later.
The Imaging Gap the Defense Uses Against You
CT scans, the standard first-line imaging in the emergency department, are excellent at showing bleeding and fractures. They are not designed to show the microscopic shearing of axons that happens when soft brain tissue accelerates and decelerates inside a rigid skull. Standard MRI catches more, but it still misses much of what happens at the cellular level.
That gap is why defense radiologists read the ER scans as normal and argue there is no injury. It is also why the peer-reviewed medical literature is careful about advanced imaging. Diffusion tensor imaging, or DTI, can measure the integrity of white matter tracts and has real research value. But in 2011, a group of neuropsychiatrists writing in the Journal of the American Academy of Psychiatry and the Law concluded that DTI plays only a modest role in mild TBI litigation and warned about “powerfully misleading testimony based on DTI interpretations.” The same author revisited the subject in 2022 and reaffirmed that conclusion.
Institutional guidance points the same direction. The American College of Radiology’s 2021 Appropriateness Criteria for Head Trauma rate DTI as “usually not appropriate” across all head trauma scenarios. The Radiological Society of North America’s 2021 statement on TBI imaging concluded that, at the present time, there is insufficient evidence supporting the routine clinical use of DTI and similar advanced techniques for diagnosis or prognosis at the individual patient level. DTI can add value in the right hands and with careful framing, but a case cannot rest on it. Cases are built on layered evidence.
How a Mild TBI Case Actually Gets Proven
The strongest mild TBI cases pull from four sources of evidence, and no single source carries the weight alone.
The first source is the contemporaneous clinical record. This includes the emergency department note that documents confusion or amnesia at the scene, the paramedic report that captured a Glasgow Coma Scale below 15, and the primary care visit in the days after the crash where the person reported symptoms they had not experienced before. Records created without an eye toward litigation carry substantial evidentiary weight, which is why getting evaluated promptly is one of the highest-leverage steps a person can take.
The second source is neuropsychological testing. A licensed neuropsychologist administers a validated battery of tests that measure memory, processing speed, executive function, and mood. Results are compared to demographic norms and, when possible, to a pre-injury baseline drawn from academic records, work performance evaluations, or prior testing. Neuropsychological testing carries weight in court because it is standardized, replicable, and difficult to fake without the neuropsychologist detecting it through embedded validity measures.
The third source is lay witness observation. Coworkers, close friends, and family members are often the first to notice cognitive change because they have baseline knowledge of the person before the injury. A supervisor who watches an employee take three tries to complete a routine task, or a friend who describes new word-finding problems in casual conversation, provides before-and-after evidence in a way a scan report never can. Courts and juries give real weight to that kind of testimony because it reflects observable change over time.
The fourth source is treating physician opinion. A neurologist, physiatrist, or neuropsychiatrist who has examined the patient, reviewed the imaging, and correlated symptoms with the mechanism of injury is often the person best positioned to tie the pieces together. That opinion carries evidentiary weight beyond what a retained expert alone can provide.
The Deadline That Catches Mild TBI Victims
California’s standard statute of limitations for personal injury is two years from the date of the accident under Code of Civil Procedure section 335.1. The clock runs whether the person has been diagnosed or not.
Mild TBI creates a specific version of the delayed-diagnosis problem. Symptoms often surface days or weeks after the impact. Some patients are not referred to a neuropsychologist for six months. By the time a specialist confirms the diagnosis, the crash may already be a year in the past. Filing a personal injury lawsuit in Orange County means filing in unlimited civil at the Central Justice Center at 700 Civic Center Drive West in Santa Ana, and the clerk does not care whether the plaintiff had a diagnosis on day one or day 700. The only question is whether the complaint gets filed inside the two-year window.
There is also a shorter clock if a government entity had any role in the crash, such as a dangerous roadway condition on a state route or a public vehicle involved in the collision. In those cases, Government Code section 911.2 requires a formal claim within six months of the incident. Missing that six-month window closes the door on the government defendant permanently.
What a Mild TBI Case Can Recover
California allows recovery of both economic and non-economic damages in personal injury cases. Economic damages cover past and future medical expenses, including neuropsychological rehabilitation and cognitive therapy, along with lost wages and any reduction in earning capacity. For someone whose work required sustained focus, memory, or executive function, that reduction can be substantial and usually requires vocational expert testimony to quantify accurately. In cases where cognitive impairment is permanent, the analysis moves into catastrophic injury territory, with life care plans documenting lifetime medical and support costs.
Non-economic damages compensate for pain, suffering, cognitive frustration, emotional impact, and loss of enjoyment of life. California places no statutory cap on non-economic damages in ordinary personal injury cases. Where a mild TBI has meaningfully reduced a person’s ability to work, socialize, or think clearly, non-economic damages often form the larger portion of a total recovery.
Steps to Take After a Suspected Concussion
First, get medical evaluation the same day, even if symptoms feel minor. A same-day record ties symptoms to the crash mechanism and closes off the defense argument that the injury came from something else.
Second, tell every treating provider about every symptom, including ones that feel unrelated. Sleep disruption, mood changes, sensitivity to light, and difficulty concentrating are all part of the clinical picture, and gaps in the symptom history become gaps in the case.
Third, keep a symptom journal. A dated log of headaches, memory lapses, and functional problems creates contemporaneous evidence that outlasts memory.
Fourth, avoid recorded statements to any insurer before speaking with an attorney who understands brain injury cases. Statements made in the early weeks, before the diagnosis is complete, are used against the claim later.
Fifth, ask a treating physician for a referral to a neuropsychologist if symptoms persist beyond a few weeks. Waiting six months to see a specialist is common; it is also one of the biggest reasons mild TBI cases underperform.
Frequently Asked Questions
My CT scan was normal. Does that mean I do not have a brain injury?
No. CT scans are designed to show bleeding and fractures. They are not designed to show the microscopic axonal injury that produces most mild TBI symptoms. A normal CT rules out bleeding. It does not rule out injury.
How long do I have to file a claim in California?
Two years from the date of the accident for most personal injury claims under Code of Civil Procedure section 335.1. Six months if a government entity is involved under Government Code section 911.2. Waiting for a diagnosis before consulting an attorney does not extend either deadline.
Is DTI or advanced imaging worth doing?
Sometimes, but it is not the case-winner some marketing suggests. The 2021 American College of Radiology criteria and the 2021 RSNA statement both concluded that advanced techniques including DTI are not appropriate for routine clinical or forensic use in individual patients. Cases are won on clinical history, neuropsychological testing, and lay witness observation, with imaging playing a supporting role.
What if my symptoms did not start until weeks after the crash?
Delayed symptom onset is well-documented in the mild TBI literature and does not undermine the claim on its own. What it does is make prompt documentation important, because insurers argue that late-appearing symptoms came from something else.
Does Kyle Wunderli’s BIAA certification make a real difference?
The Brain Injury Association of America’s Certified Brain Injury Specialist credential requires specialized training and examination in brain injury care and its legal implications. Kyle holds that certification, which is uncommon among plaintiff attorneys in Orange County. It reflects the depth of preparation these cases require. It is not a guarantee of any particular outcome.
How Wunderli Injury Law Handles Mild TBI Cases
Mild TBI cases are won on preparation. Wunderli Injury Law, PC represents injured people throughout South Orange County, including Dana Point, San Clemente, Laguna Beach, Mission Viejo, and the surrounding communities. Kyle J. Wunderli is a Certified Brain Injury Specialist through the Brain Injury Association of America, a credential that shapes how the firm evaluates and prepares these cases from day one.
If you or someone you know has been in a collision on I-5, PCH, or anywhere else in Orange County and is dealing with lasting symptoms that scans did not explain, call the office at (949) 866-3833 or visit our contact page for a free consultation. There is no attorney fee unless we recover compensation for you, and no costs are owed unless we win.
LEGAL DISCLAIMER
This article is for informational purposes only and does not constitute legal advice. Reading this content does not create an attorney-client relationship. If you have been injured, contact a qualified California personal injury attorney to discuss your rights. Wunderli Injury Law, PC serves clients throughout Southern California.
Footnotes
1. American Congress of Rehabilitation Medicine, mild traumatic brain injury definition. https://acrm.org.
2. Providence Mission Hospital Mission Viejo, Trauma Center overview. https://www.providence.org/locations/socal/mission-hospital-mission-viejo/trauma-center. Verified live July 28, 2026. Only American College of Surgeons verified adult and pediatric Level II Trauma Center in South Orange County.
3. Wortzel HS, Kraus MF, Filley CM, Anderson CA, Arciniegas DB, “Diffusion Tensor Imaging in Mild Traumatic Brain Injury Litigation,” 39 J. Am. Acad. Psychiatry Law 511 (2011). https://jaapl.org/content/39/4/511. Verified live July 28, 2026.
4. Wortzel HS, “Advanced Neuroimaging and Mild Traumatic Brain Injury Litigation, Revisited,” 50 J. Am. Acad. Psychiatry Law 336 (2022). https://jaapl.org/content/50/3/336. Verified live July 28, 2026; source of the “powerfully misleading testimony based on DTI interpretations” reference.
5. Shih RY, Burns J, Ajam AA, et al., “ACR Appropriateness Criteria Head Trauma: 2021 Update,” 18 J. Am. Coll. Radiol. S13 (2021). Rating DTI as “usually not appropriate” across head trauma scenarios.
6. Radiological Society of North America, Statement on Traumatic Brain Injury (TBI) Imaging (2021). https://www.rsna.org. Statement text quoted in the 2022 JAAPL revisit at footnote 4 above.
7. Cal. Code Civ. Proc. section 335.1 (two-year statute of limitations for personal injury).
8. Cal. Gov. Code section 911.2 (six-month deadline for claims against public entities).
9. Superior Court of California, County of Orange, Central Justice Center, 700 Civic Center Drive West, Santa Ana. https://www.occourts.org/location/central-justice-center.
10. Brain Injury Association of America, Certified Brain Injury Specialist certification. https://www.biausa.org.