An arteriovenous malformation (AVM) is a rare but potentially serious condition involving a tangled network of abnormal blood vessels that connect arteries and veins. This abnormal connection disrupts normal blood flow and oxygen circulation and can place significant pressure on surrounding tissues.
AVMs can develop anywhere in the body but are most commonly found in the brain or spinal cord. If left undiagnosed or untreated, they can rupture and cause life-threatening bleeding, stroke, or permanent neurological damage.
Where an AVM is misdiagnosed or diagnosed too late, the consequences can be devastating. In some circumstances, failures in medical care may give rise to a clinical negligence claim.
Symptoms of an Arteriovenous Malformation
Symptoms can vary depending on the location and size of the AVM. In some cases, an AVM may remain undetected until it ruptures.
Common symptoms may include:
- Persistent or severe headaches
- Seizures
- Neurological symptoms such as weakness, numbness, or vision problems
- Difficulties with speech or coordination
- Back pain or neurological symptoms if the AVM affects the spinal cord
Because these symptoms may develop gradually or mimic other neurological conditions, careful medical assessment is essential.
Treatment Options for Arteriovenous Malformations
Treatment for an AVM depends on several factors, including its size, location, and the symptoms experienced by the patient.
In some cases, particularly where the AVM is small and not causing symptoms, doctors may recommend careful monitoring with regular imaging scans and medication to manage symptoms such as seizures or headaches.
Where the risk of rupture is considered higher, more active treatment may be recommended.
Treatment options may include:
- Endovascular embolisation, which blocks abnormal blood vessels to reduce blood flow to the AVM
- Microsurgical resection, where surgeons remove the malformation
- Stereotactic radiosurgery, which uses targeted radiation to gradually close the abnormal vessels
Many patients receive a multimodal treatment approach, where two or more of these treatments are used in combination to reduce surgical risk and improve outcomes.
When Delayed Diagnosis of an AVM May Amount to Medical Negligence
Medical professionals are expected to investigate symptoms appropriately and consider serious underlying conditions where clinically indicated.
A breach of duty of care may occur if a healthcare professional fails to recognise warning signs that should prompt investigation for an AVM, or if appropriate diagnostic tests are not carried out.
For example, negligence may arise where:
- Symptoms suggesting a neurological condition are not properly investigated
- Appropriate imaging scans such as MRI or CT scans are not arranged
- Abnormal scan results are misinterpreted or overlooked
- Referrals to neurological specialists are delayed
Each case depends on whether the care provided fell below the standard expected of a reasonably competent healthcare professional in the same circumstances.
Establishing Causation in AVM Medical Negligence Claims
In medical negligence cases, it must also be shown that the failure in care caused or materially contributed to the patient’s injury.
In the context of an AVM, this may involve demonstrating that:
- An earlier diagnosis would likely have led to treatment
- That treatment would probably have prevented a rupture or other complications
- The delayed diagnosis therefore contributed to the patient’s injuries
This stage of a claim typically requires independent expert medical evidence to assess whether earlier intervention would have changed the outcome.
How Our Medical Negligence Solicitors Can Help
If you or a loved one has suffered harm due to a delayed diagnosis or mismanagement of an arteriovenous malformation, you may be entitled to pursue a medical negligence claim.
Our specialist clinical negligence team has experience investigating complex neurological injury cases. We can review your medical records, obtain expert evidence, and advise you on whether the treatment you received fell below the expected standard of care.
If you would like to discuss your situation with our team, please call 01244 354688 for a confidential, no-
