Enlarged Vestibular Aqueduct

Overview

An enlarged vestibular aqueduct (EVA) is a condition where a small bony channel in the inner ear is wider than usual. The inner ear helps you hear and keep your balance. This wider channel is present before birth. It can affect hearing, balance, or both, and the effects can range from mild to serious.

EVA is uncommon. It is one of the more common inner-ear malformations found in children who have hearing loss.

EVA can affect children and adults, but it is often found in childhood when hearing loss, speech delay, or balance problems are checked. It can run in families.

Symptoms

Common symptoms

• Hearing loss in one or both ears, which may be stable, slowly worse, or sudden
• Ringing or buzzing in the ears, called tinnitus
• Dizziness or a spinning feeling, called vertigo
• Balance problems or unsteadiness
• Speech or language delay in young children

Symptoms in children

• Not responding to sounds or turning toward voices less often
• Speech that is late or hard to understand
• Trouble listening at school or needing things repeated
• Balance that seems behind other children, or more falls than expected
• A sudden drop in hearing after a head bump or pressure change

Symptoms in older adults

• EVA is usually found in childhood, but some adults are diagnosed later.
• Adults may notice gradual hearing loss, ringing in the ears, or unsteadiness.
• Older adults may also have other causes of hearing or balance problems, so a full check is important.

Causes

Main causes

• EVA is a congenital inner-ear malformation. That means the channel is already wider than usual before birth.
• Changes in certain genes can affect how the inner ear develops. Sometimes EVA runs in families.
• It can happen alone or as part of a genetic condition that also affects hearing or other parts of the body, such as the thyroid gland in the neck.

Risk factors

• Family history of EVA, childhood hearing loss, or a related genetic condition
• Having a genetic syndrome or gene change linked to inner-ear development
• Being born with hearing loss that is found on newborn screening
• Head injury can trigger a sudden drop in hearing in someone who already has EVA, but it does not cause EVA.

When to see a doctor

See a doctor urgently if:

• Sudden hearing loss or a sudden big change in hearing
• New severe dizziness, vertigo, or balance problems
• Ear pain, discharge, fever, or signs of infection
• Signs of meningitis — call your local emergency number right away

Book a routine appointment if:

• Hearing that is slowly getting worse
• Ringing or buzzing in the ears that bothers you
• A child with speech delay, school listening problems, or balance concerns
• A family history of EVA or childhood hearing loss
• Before contact sports or activities with pressure changes, ask your specialist about precautions

Diagnosis

A doctor, usually an ear, nose, and throat specialist or an audiologist, will ask about hearing and balance, do hearing tests, and look at pictures of the inner ear. In children, the care team may also check speech and language.

Tests that may be done

• Hearing tests, called audiometry, for you or your child
• Balance tests to check how well the inner ear and body work together
• CT or MRI scan of the inner ear — special pictures that show the shape of the inner ear
• Genetic counseling or testing if there is a family history or other signs
• Review of newborn hearing screening or school hearing screening results

What to expect at your appointment

Most tests are painless. Children may need to sit still or, rarely, be sedated for a scan. Results help your care team plan monitoring and support.

Treatment

There is no way to make the aqueduct smaller. Treatment focuses on hearing, balance, and preventing complications. Care is often shared by ear, nose, and throat specialists, audiologists, speech therapists, and your family doctor.

Self-care at home

• Protect your hearing around loud noise.
• Wear helmets and take care to avoid head injury.
• Keep routine vaccinations up to date. Ask your doctor which vaccines are recommended.
• Write down hearing or balance changes and bring them to appointments.
• For children, ask the school about hearing support and classroom seating.

Medical treatments

Hearing aids can help with mild to moderate hearing loss. For severe hearing loss, a cochlear implant may be an option after specialist assessment. Speech and language therapy supports children. Balance therapy can help dizziness and unsteadiness. Your team may recommend regular hearing tests to track changes. No medicine can fix the shape of the aqueduct.

When is surgery considered?

Surgery is not needed for most people. A cochlear implant is a device placed by surgery for some people with severe hearing loss. Surgery may also be discussed in rare cases of repeated meningitis linked to an inner-ear malformation. Your specialist will explain benefits and risks.

Living with this condition

Day to day, focus on hearing access and fall prevention. Use hearing aids or other devices as advised, keep appointments, and tell teachers or employers about hearing needs.

Lifestyle tips

• Use captions and assistive listening devices if they help.
• Reduce background noise when talking.
• Keep rooms well lit and walkways clear to reduce falls.
• Ask your specialist before scuba diving, sky diving, or contact sports, because pressure and head injury can matter.

Diet and exercise

No special diet treats EVA. Regular exercise can improve balance and general health. Choose activities with low fall risk, like walking or swimming with supervision if balance is poor. Ask your doctor before activities with pressure changes.

Mental health and emotional wellbeing

Hearing loss and dizziness can be tiring and can make social times harder. It is normal to feel frustrated or worried. Talk with your care team about support. If you or your child feel hopeless or in crisis, contact your local emergency number or a local crisis service.

Prevention

EVA cannot be prevented because it is present before birth. You can lower the chance of complications by protecting the head, protecting hearing, keeping vaccinations up to date, and having regular hearing checks.

Vaccines

Routine vaccinations are important. Ask your doctor which vaccines are recommended for you or your child, including any that help prevent meningitis.

Screening programmes

Newborn hearing screening helps find hearing loss early. If EVA runs in your family, ask your doctor about hearing checks and genetic counseling for relatives.

Complications

If left untreated

• Hearing loss may get worse over time or drop suddenly.
• Children may have delayed speech, language, or learning if hearing loss is not supported.
• Balance problems can increase the risk of falls.
• Rarely, people with inner-ear malformations have a higher risk of meningitis.
• Tinnitus and social isolation can affect quality of life.

Long-term outlook

Most people with EVA can do well with regular monitoring and support. Hearing may change over time, so checkups matter. Early help with hearing, speech, and balance gives the best chance for children to thrive.

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