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Jaw Cyst: Causes, Symptoms & Treatment

A jaw cyst is a fluid-filled cavity within the jawbone. It can cause pain, swelling, and bone loss, and is usually treated surgically by an oral and maxillofacial surgeon.

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Things worth knowing about "Jaw cyst"

A jaw cyst is a fluid-filled cavity within the jawbone. It can cause pain, swelling, and bone loss, and is usually treated surgically by an oral and maxillofacial surgeon.

What Is a Jaw Cyst?

A jaw cyst is a pathological, fluid-filled or semi-solid cavity within the jawbone that is lined by an epithelial membrane. Jaw cysts are among the most common benign lesions of the jaw and can occur in both the upper jaw (maxilla) and the lower jaw (mandible). They grow slowly but can progressively damage surrounding bone tissue and the roots of adjacent teeth if left untreated.

Causes and Types

Jaw cysts are classified into several types based on their origin:

Radicular cyst (periapical cyst): The most common type. It develops as a result of chronic inflammation at the root tip of a tooth, usually caused by a non-vital (dead) tooth or untreated tooth decay.
Follicular cyst (dentigerous cyst): Forms around the crown of an unerupted tooth, most commonly a wisdom tooth. It is classified as a developmental cyst.
Keratocyst (odontogenic keratocyst): A more aggressive type arising from dental tissue remnants, known for its high tendency to recur after treatment.
Residual cyst: Remains in the jawbone after a tooth extraction if the original cyst was not fully removed during the procedure.
Non-odontogenic cysts: Arise from non-dental tissues, for example the nasopalatine duct cyst located in the anterior palatal region.

Symptoms

Jaw cysts are often asymptomatic for extended periods and are frequently discovered incidentally on routine dental X-rays. When symptoms do occur, they may include:

Painless or painful swelling in the jaw or gum area
Pressure sensation or dull aching pain in the jaw
Numbness of the lip or chin (if the inferior alveolar nerve is involved)
Loosening or displacement of adjacent teeth
Visible deformation or expansion of the jawbone in larger cysts
Purulent infection if the cyst becomes secondarily infected

Diagnosis

Diagnosis is primarily based on dental imaging performed by a dentist or oral surgeon:

Orthopantomogram (OPG): A panoramic X-ray of the entire jaw that shows cysts as well-defined, round radiolucent (dark) areas.
Cone beam computed tomography (CBCT / DVT): A three-dimensional imaging technique that allows precise assessment of the cyst location, size, and relationship to adjacent structures.
Histological examination: The surgically removed cyst tissue is examined under a microscope to confirm the cyst type and rule out malignant changes.

Treatment

Treatment of a jaw cyst is typically surgical and depends on the size, location, and type of cyst:

Cystectomy

Cystectomy involves the complete surgical removal of the cyst from the jawbone. This is the preferred method for small to medium-sized cysts and allows for complete histological analysis of the excised tissue.

Cystostomy (Marsupialization)

For large cysts, a cystostomy (marsupialization) may be performed: the cyst cavity is opened and permanently connected to the oral cavity, allowing the cyst to gradually shrink over time. This approach helps preserve surrounding bone and vital structures.

Root Canal Treatment

In cases of radicular cysts, a root canal treatment of the affected tooth may also be required to eliminate the source of chronic inflammation.

Follow-up Care

Regular follow-up appointments after surgery are essential to detect any recurrence early. In the case of odontogenic keratocysts, follow-up monitoring over several years is strongly recommended due to the elevated recurrence rate.

References

Reichart PA, Philipsen HP. Odontogenic Tumors and Allied Lesions. Quintessence Publishing, London, 2004.
Neville BW et al. Oral and Maxillofacial Pathology. 4th Edition. Elsevier, 2015.
World Health Organization (WHO). WHO Classification of Head and Neck Tumours. 4th Edition. IARC Press, Lyon, 2017.

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