Jaw cysts and tumors: diagnosis and surgery

Many jaw cysts don't hurt: they show up on a routine X-ray or as a bump on the gum. They still need treatment, because they grow and thin the bone. Before I operate I measure the lesion on a CT scan and confirm what it is with a biopsy; with that diagnosis I walk you through the options and we decide together.

Imaging

Panoramic X-ray and CT scan (CBCT)

Diagnosis

Biopsy and pathology

Anesthesia

Local; for larger lesions, per the plan

Follow-up

Clinical and with X-rays

When it's indicated

• A dark area or a cyst in the bone on a routine X-ray.
• A swelling of the gum, palate or jaw, or a tooth that shifts for no reason.
• A cyst around a wisdom tooth or canine that never came in (dentigerous cyst).
• An unexplained ulcer lasting more than 3 weeks, or a sore that hasn't healed 2 weeks after removing whatever was rubbing it.
• A red patch, a red-and-white patch, or a white one that doesn't rub off.
• A papilloma or another lump on the lip or inside the mouth.

Before surgery

• Bring any X-rays or CT scans you have, with their reports: sometimes they spare you a repeat scan.
• List your medications. If you take blood thinners, don't stop them on your own: continuing is usually preferred, because stopping is associated with a higher risk of clots. I coordinate it with your doctor.
• If there is sedation or general anesthesia, I give you written instructions on fasting and on bringing a companion.
• If the result scares you, tell me. Anxiety can make people put off the diagnosis, which is why the American Dental Association guideline stresses talking it through.

How I plan it

How I do it

1. 01AssessmentExamination and imaging. If a mouth lesion may come from rubbing (a sharp tooth, a denture), we remove the cause first and recheck it at 2 weeks.
2. 02BiopsyUnder local anesthesia, with a few stitches. The sample goes to the pathologist; results take from days to a few weeks, and I go over them with you calmly.
3. 03SurgeryDepending on the diagnosis: enucleation (removing the whole cyst), sometimes with cleaning of the surrounding bone or Carnoy's solution; for large cysts, decompression first — a small opening so the cyst shrinks — and removal later; for ameloblastoma, resection with margins or, in selected cases, conservative treatment.
4. 04Pathology of what I removeEverything I remove goes to the pathologist, to confirm the diagnosis and that it came out completely. I remove a papilloma with a margin of healthy tissue: in one case series, it came back less often with at least 3 mm.
5. 05Follow-upX-rays to confirm the bone fills in and the lesion doesn't return. For keratocysts and ameloblastomas, for years.

Recovery

• Biopsy: mild discomfort for a few days, soft food and the prescribed medication.
• Cyst: swelling is greatest in the first days and then goes down. Cold packs, a soft diet and a visit to check the area and the stitches.
• If the bone was left thin, a soft diet for longer. It fills in gradually; we follow it with X-rays.
• With decompression, the process usually lasts one to two years and generally ends with a second, less invasive surgery.
• A white or red patch that turned out not to be cancer still needs periodic, long-term follow-up.

Risks and how I prevent them

The cyst coming back

This is the main risk with keratocysts, which tend to recur: published figures range from 3% to 60% depending on the study. With enucleation (alone or with curettage, depending on the review), 22.5% to 23.1%; adding Carnoy's solution, 5.3% to 11.5%. I manage it by removing the lesion completely, with whatever adjunct the case calls for, and with follow-up.

The ameloblastoma coming back

In the solid or multicystic type it came back in 8% after bone resection and in 41% after conservative treatment; in the unicystic type, in 3% and 21%. These data come only from retrospective studies. If we choose the conservative route, check-ups are more frequent.

Numbness of the lip or chin

It can happen when the lesion surrounds the inferior alveolar nerve. That's why I measure that distance on the CT scan and plan the approach to protect it.

Neighboring teeth and fracture

A large cyst can involve nearby roots, which sometimes need a root canal or have to come out. If it thins the bone a lot, there is a risk of fracture: decompressing first may be the better choice.

Bleeding and infection

As with any surgery. With direct oral anticoagulants, bleeding after oral procedures was similar whether the drug was continued (11.8%) or stopped (13.5%), and all bleeding was controlled with local measures.

Other options

Decompressing first

For large cysts, a small opening shrinks them over one to two years and makes the second surgery less invasive. It hasn't been firmly shown to lower recurrence compared with enucleation alone.

Resecting the bone

For keratocysts it had the lowest recurrence in two reviews, 2.2% to 8.4%, but with a bigger impact. The authors of one propose reserving it for lesions that recur several times and, possibly, syndromic cases.

Waiting and watching

Reasonable for a typical canker sore, which heals on its own in one to two weeks (a topical steroid eases the pain and shortens healing), or for a sore whose cause gets corrected. Not for a bone lesion without a diagnosis.

Frequently asked questions