Short answer
Yes. CT scans and standard MRIs are designed to find bleeding, swelling, fractures, and other structural damage, not the microscopic stretching and tearing of nerve fibers that causes most concussion symptoms. Most people with a concussion have normal imaging. A concussion is diagnosed clinically, from how the injury happened, your symptoms, and your neurological exam, and a normal scan does not rule it out or end an injury claim.
Answered by Kweku Darfoor, Esq., founder of The Injury Advocates, a Plantation-based personal injury law firm serving Fort Lauderdale, Broward County, and South Florida. General information, not legal advice about your situation.
An emergency room orders a CT scan to answer one question quickly: is there bleeding, swelling, or a skull fracture that needs surgery tonight? CT is excellent at that job and poor at everything else. A standard MRI gives a more detailed picture of soft tissue and can show bruising or small bleeds a CT missed, but it still images the brain at a scale far larger than the injured nerve fibers.
The damage behind most concussion symptoms is diffuse axonal injury: the long fibers that connect brain cells are stretched and sheared by the sudden acceleration and deceleration of a crash or a fall. That injury happens at a microscopic level. Routine imaging cannot see it, which is why a large share of people with a mild traumatic brain injury have scans that are read as normal.
A concussion is a clinical diagnosis. Doctors look at the mechanism of injury (a rear-end collision, a fall down stairs, a head striking the pavement), the symptoms that followed (headache, dizziness, nausea, confusion, memory gaps, sensitivity to light and noise, trouble concentrating, sleep changes, mood changes), and the findings on examination: balance, eye movements, reaction time, and cognitive screening. When symptoms persist, a neurologist or a neuropsychologist takes over.
Neuropsychological testing is the most important tool in a disputed case. Over several hours, it measures memory, attention, processing speed, and executive function against established norms and includes validity measures that show whether the person is giving full effort. It is objective evidence of how the injury affects your thinking, and it does not depend on a picture of the brain.
Some imaging can detect what a routine scan cannot. Diffusion tensor imaging (DTI) measures the integrity of white-matter tracts; susceptibility-weighted imaging (SWI) is far more sensitive to tiny bleeds; functional MRI, PET, and SPECT look at how the brain works rather than how it looks. These studies are used selectively, usually by a specialist and usually when symptoms persist, and insurers often challenge them. They can strengthen a case, but they are not required to prove one.
“The scans were negative” is the first sentence in many denial letters, and it is written for an audience that does not know the medicine. The answer is the medicine: the emergency room chart that records the mechanism and the early symptoms, the treating neurologist’s findings, neuropsychological testing, vestibular and vision therapy records, and the people who knew you before the injury, a spouse, a supervisor, a coworker, who can describe how you changed.
In a Florida car accident case there is a second reason the medical record matters. To recover pain-and-suffering damages from an at-fault driver, you generally must prove a permanent injury within a reasonable degree of medical probability. A lasting cognitive or neurological deficit documented by the right specialists can meet that threshold; a normal scan by itself does not defeat it. How we prove a brain injury claim →
Call 833-DARFOOR or (754) 812-8444, or text (754) 289-3211. Phones are answered 24/7, consultations are free, and attorney Kweku Darfoor is personally involved in every case.
If your symptoms last more than a few days, ask your doctor. An MRI can show injuries a CT misses, and even a normal result is useful because it rules out other problems. The decision is a medical one, but a documented request and a follow-up visit also create the record an insurer cannot wave away.
Often, yes, especially when the scans are normal. That is why neuropsychological testing matters: it includes built-in validity measures that show whether a person is giving full effort, which makes the results hard to dismiss. Consistent treatment records and before-and-after witnesses do the rest.
