Hearing after temporal bone surgery: what changes and what helps | CION Cancer Clinics

Yes, through your other ear, provided it was healthy before surgery. On the operated side, hearing is usually much reduced after a smaller operation and completely lost after a larger one.

Why hearing changes on that side

Sound travels down the ear canal, vibrates the eardrum and three tiny bones, and reaches the cochlea, the snail-shaped hearing organ deep in the bone. A temporal bone resection removes some or all of that pathway along with the cancer. If only the canal, eardrum and tiny bones go, the cochlea still works, but sound can no longer reach it the usual way. If the cochlea is removed too, that ear can no longer turn sound into signals for the brain.

Why your other ear matters so much

Your good ear now does all the work. That is why both ears are tested before surgery, and why protecting the remaining ear from loud noise, wax build-up and untreated infection matters for the rest of your life.

Some people benefit from a device and some do not. It depends on what was removed, whether the cochlea still works, and how healthy the skin and bone are after surgery and radiotherapy.

Bone-conduction devices

These pick up sound and pass it as vibration through the skull bone, straight to a working cochlea. Some are worn on a headband; others attach to a small implant fixed in the bone. They can help after a lateral resection, where the cochlea remains. They cannot help an ear whose cochlea has been removed. An implant may also not suit bone that has had radiotherapy, because that bone heals poorly.

Ordinary hearing aids

A standard aid needs an open ear canal. After most temporal bone resections the canal is closed, so an ordinary aid on that side is not possible. An aid may still help your other ear if its hearing is reduced.

Cochlear implants

A cochlear implant needs a working hearing nerve and is rarely used on the operated side after cancer surgery. Ask your team whether it has any role for you.

It cannot tell you exactly how much hearing you will have. That depends on the operation you need, your hearing before surgery and whether radiotherapy follows. Your surgeon and audiologist can give a clearer picture once they have your scans and test results.

Questions worth asking before surgery

Ask which parts of the ear will be removed and whether the cochlea will be kept. Ask what the hearing test shows for your other ear. Ask whether a bone-conduction device might suit you later, and whether radiotherapy would change that. Write the answers down, or bring someone who can.

When to seek help quickly

A sudden drop in hearing in your good ear, or dizziness with vomiting that does not settle, should be checked the same day. Call your surgical team rather than waiting for your next appointment.