Some of the most serious consequences of a car accident may not become apparent at the scene.
A person can walk away feeling relatively normal, only to develop severe headaches, vision problems, dizziness, or vomiting several days later. In rare cases, those symptoms may signal an arterial dissection or traumatic aneurysm caused by damage to a blood vessel.
During this episode of Mind Matters: Navigating Head Injuries and Concussions, legal nurse consultant Kiley Como continued her conversation with attorney Thomas Ozbolt of Shane Smith Law’s concussion and brain injury group. They discussed delayed vascular injuries, medical warning signs, and why detailed documentation is essential when connecting a later diagnosis to an accident.
A Minor Crash Can Still Have Serious Consequences
Thomas described an example involving a healthy 24-year-old man who was involved in a relatively minor collision.
He felt fine at the scene and reported no immediate injury. Several days later, however, he developed severe headaches and vision problems.
A CT angiogram revealed an arterial dissection.
Doctors could then begin treatment intended to reduce the risk of a stroke, followed by rehabilitation.
The example demonstrates why feeling fine immediately after an accident does not guarantee that every injury has been ruled out.
What Is an Arterial Dissection?
An arterial dissection occurs when a tear develops in the inner layer of an artery.
Blood may enter that tear and begin separating the layers of the artery wall. This can narrow the passageway, disrupt normal blood flow, or contribute to the formation of a clot.
If blood flow to the brain becomes blocked, the person may experience a stroke.
Symptoms can include:
- Sudden or severe headaches
- Dizziness
- Vision changes
- Unequal pupils
- Neck pain
- Weakness or numbness
- Difficulty speaking
- Loss of coordination
These symptoms may have other causes, but they require prompt medical attention after head or neck trauma.
Traumatic Aneurysms May Also Appear Later
Thomas also discussed an example involving a young athlete who struck their head during a game.
The athlete initially appeared normal but later developed severe headaches, dizziness, and vomiting. Imaging revealed a traumatic aneurysm that required surgical repair.
A traumatic aneurysm occurs when an injury weakens part of a blood vessel, causing it to bulge outward.
If the aneurysm ruptures, it can cause severe bleeding around or inside the brain.
The lack of immediate symptoms does not mean the condition is harmless. Some vascular injuries develop or become symptomatic gradually.
Sudden Neck Movement Can Be a Risk
Car crashes are not the only events associated with arterial dissections.
Thomas discussed how sudden or intense neck movement could potentially trigger a dissection in someone who is particularly vulnerable because of an underlying condition such as Marfan syndrome.
Certain yoga positions, backbends, sports movements, or forceful stretches may involve significant extension or rotation of the neck.
That does not mean people should stop exercising or practicing yoga.
The lesson is to avoid violent or abrupt stretching and recognize concerning symptoms when they appear afterward.
Thomas emphasized that stretches should be controlled rather than forceful or jerking.
Whiplash Creates Rapid Acceleration and Deceleration
Rear-end collisions commonly create a whiplash motion.
The head and neck may move rapidly backward and forward as the vehicle is struck. This sudden acceleration and deceleration can place stress on the muscles, joints, nerves, and blood vessels.
A person does not necessarily need to hit their head for a serious injury to occur.
After a collision or forceful neck movement, sudden headaches, dizziness, unequal pupils, or visual changes should be taken seriously.
Seeking immediate care allows doctors to determine whether the symptoms are caused by a vascular injury, concussion, whiplash, migraine, or another condition.
The Medical Team Needs the Full Story
When someone develops a severe headache several days after an accident, they may visit the emergency room and report only the headache.
They may not think to mention the recent collision.
Kiley and Thomas stressed the importance of giving the medical team that context.
Doctors often do not have immediate access to every prior medical record. They must make decisions based largely on what the patient tells them during the visit.
Important details may include:
- The date of the accident
- Whether the head or neck moved suddenly
- When symptoms began
- Whether the symptoms are worsening
- Previous headaches or neurological problems
- Current medications
- Any underlying connective tissue or vascular condition
Mentioning the accident may affect which diagnoses the physician considers and which tests are ordered.
Treatment Comes Before Legal Questions
When someone arrives at the hospital with a potentially life-threatening vascular condition, doctors are focused on diagnosis and treatment.
They are not primarily concerned with proving whether a car accident caused the condition for a future lawsuit.
Their priority is preventing a stroke, stopping bleeding, repairing the blood vessel, and protecting the patient’s life.
Because of that, the hospital record may not contain a detailed statement connecting the diagnosis to the crash.
A medical expert may later need to review the timing, imaging, mechanism of injury, prior health, and complete treatment history to determine whether the accident likely caused or contributed to the vascular injury.
Why These Cases Are Difficult to Prove
Arterial dissections and traumatic aneurysms are relatively uncommon after car accidents.
An insurance company may argue that the condition resulted from something else, such as:
- Marfan syndrome
- Another connective tissue condition
- A previous injury
- Medication use
- Exercise or yoga
- A spontaneous vascular event
The injured person’s attorney must show more than the fact that an accident happened before the diagnosis.
The evidence must establish a medically reasonable connection between the trauma and the vascular condition.
That may require complete medical records, imaging, specialist opinions, and expert testimony.
Look at the Entire Medical Picture
Kiley compared a complicated injury case to viewing a large painting.
When someone stands too close, they see only one small area. Stepping back reveals how every part fits into the larger image.
The same approach applies to delayed neurological injuries.
The medical and legal teams may need to examine:
- The person’s health before the accident
- Previous symptoms or diagnoses
- The mechanics of the collision
- The timing of new symptoms
- Emergency room records
- Imaging results
- Treatment recommendations
- Changes in work and daily activities
- Expert medical opinions
One isolated medical note rarely tells the entire story.
Low Vehicle Damage Does Not End the Analysis
Thomas described a hypothetical case involving approximately $500 in vehicle damage followed by an arterial dissection diagnosed one week later.
The insurance company might argue that the collision was too minor to cause the injury.
It might also claim that an underlying condition or an activity such as yoga was responsible.
The injured person’s legal team would need to examine what changed.
Perhaps the person had practiced yoga several times a week for years without any neurological symptoms. The collision may have been the only significant new event before the headaches and visual problems began.
That evidence can help explain why the accident is the more likely cause, but it must still be supported by qualified medical testimony.
Be Honest and Thorough With Your Doctors
Thomas advised patients to report everything that is bothering them, from the top of the head to the bottom of the feet.
They should never exaggerate or describe symptoms they do not have.
They also should not leave out real symptoms because they seem minor, unrelated, or embarrassing.
A person may tell a spouse about repeated headaches or vision problems but forget to mention them during a medical appointment.
If those symptoms never appear in the records, an insurer may later argue that they did not begin until much later.
Healthcare providers cannot document symptoms they were never told about.
Documentation Builds the Timeline
Detailed medical records help establish when symptoms began and how they changed.
Important documentation may include:
- Reports of headaches or dizziness
- Vision complaints
- Nausea or vomiting
- Emergency room visits
- Imaging results
- Specialist evaluations
- Work restrictions
- Rehabilitation
- Changes in daily functioning
- Follow-up recommendations
Consistent reporting makes it easier to understand the progression from the accident to the diagnosis.
As Thomas explained, when symptoms are not reported or documented, proving that they occurred becomes much more difficult.
Preexisting Conditions Require Careful Evaluation
A preexisting condition does not automatically prove that the accident was unrelated to the injury.
Someone may have a condition that makes an artery more vulnerable. The collision may still be the event that caused the artery to tear.
The evaluation should consider how the person functioned before the crash.
Were they experiencing headaches, dizziness, or vision problems? Were they working and completing normal activities? Did their condition become symptomatic only after the accident?
Prior medical records can help establish that comparison.
Medical Evidence Connects the Dots
A legal argument alone cannot establish medical causation.
Complicated vascular injury claims may require:
- CT angiography or magnetic resonance angiography
- Emergency and hospital records
- Neurological examinations
- Neurosurgical evaluations
- Expert review of the accident mechanism
- Testimony explaining the timing of symptoms
- Evidence ruling out reasonable alternative causes
The goal is to present the full medical picture rather than relying on assumptions.
Seek Medical Care Before Worrying About the Claim
Anyone experiencing severe or worsening neurological symptoms after a collision should focus first on receiving medical care.
Tell the provider about the recent accident, describe every symptom honestly, and explain when each problem began.
The legal questions can be addressed after the immediate danger has been evaluated.
Delayed vascular injuries may be uncommon, but their consequences can be severe. Recognizing the warning signs, providing doctors with the full history, and creating a complete medical record may protect both the person’s health and their ability to explain what happened later.
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