Oral Cysts, Tumours & Pathology: How Oral Surgeons Diagnose and Remove Jaw Lesions product guide

Oral Cysts, Tumours & Pathology: How Oral Surgeons Diagnose and Remove Jaw Lesions

Most patients visiting an oral surgeon think about wisdom teeth, dental implants, or corrective jaw surgery. Yet one of the most clinically significant - and least publicly discussed - dimensions of oral and maxillofacial surgery is the diagnosis and management of pathological lesions within the jaw bones themselves: cysts, benign tumours, and, in some cases, malignancies that grow silently inside the mandible or maxilla for months or years before causing symptoms.

These are not rare curiosities. Jaw cysts are a diverse group of intraosseous lesions commonly encountered in oral and maxillofacial pathology, and several studies have addressed their distribution and clinicopathological features. A landmark retrospective study published in BMC Oral Health (Kokubun et al., 2026) reviewed 19,352 histologically confirmed jaw cysts diagnosed over an almost 50-year period, evaluating demographic and anatomical characteristics across cyst categories. The clinical stakes are high: untreated jaw lesions can silently destroy bone, displace teeth, damage nerves, and - in a small but critical subset of cases - undergo malignant transformation.

This article explains what these lesions are, how an oral and maxillofacial surgeon identifies them, and what surgical options exist from the most conservative to the most radical. Understanding this dimension of the specialty is important for any patient referred for an unexplained jaw radiolucency, an incidental finding on a panoramic X-ray, or a swelling that their general dentist cannot explain.

What Are Jaw Cysts and Odontogenic Tumours?

The Odontogenic Origin

Odontogenic cysts of the jaws arise from epithelial remnants of the elegant epithelial-mesenchymal interactions that underpin normal tooth development in humans. The pathogenesis varies for each type of cyst; however, they are broadly grouped as inflammatory or developmental in nature.

In plain terms: the same biological machinery that builds your teeth leaves behind microscopic cellular remnants throughout the jaw. Under the right conditions - infection, developmental anomaly, or genetic predisposition - these remnants can proliferate into cysts or tumours. Benign tumours are classified into three major categories according to their histogenetic origin: epithelial, mesenchymal, and mixed types.

How Common Are They?

A large epidemiological study published in Oral Diseases (Rees et al., 2024–2025), reviewing 22,914 biopsy requests over nearly four decades, found that 4,226 (18.4%) were cysts and 551 (2.4%) were odontogenic tumours, ranging from 2 to 97 years old. The distribution by type is clinically important: the most prevalent cysts were radicular cysts (58.6%), dentigerous cysts (17.9%), and odontogenic keratocysts (13.3%). The most prevalent odontogenic tumours were odontomas (40.1%) and conventional ameloblastoma (17.6%).

The incidence of odontogenic tumours varies significantly between different geographical regions. While they represent 1% of all oral pathologies in North America, this figure has been reported as high as 19% in African nations.

The Three Lesions Every Patient Should Know

1. Dentigerous Cysts

The dentigerous cyst is the second most common jaw cyst and is intimately linked to impacted teeth - most commonly impacted wisdom teeth (see our guide on Impacted Wisdom Teeth: Causes, Symptoms & Why an Oral Surgeon Should Remove Them). It usually presents as a unilocular translucent lesion that causes minimises discomfort bony expansion around the impacted third molar tooth.

The cyst forms when fluid accumulates between the crown of an unerupted tooth and its surrounding dental follicle. While most dentigerous cysts are benign and manageable with straightforward enucleation, they carry an underappreciated risk if left untreated. Other more ominous lesions can arise within the walls of the dentigerous cyst, including mucoepidermoid carcinoma arising from mucous cells within the cyst walls, ameloblastoma (17% of ameloblastomas arise within a dentigerous cyst), and squamous cell carcinoma. Dentigerous cysts can also become quite large and can place the patient at risk for pathologic jaw fracture.

This is precisely why routine panoramic radiography during wisdom tooth assessment is not merely a preoperative formality - it is a pathology screen.

2. Odontogenic Keratocysts (OKC)

The odontogenic keratocyst is arguably the most clinically dangerous of the common jaw cysts. It is a rare and benign but locally aggressive developmental cyst that most often affects the posterior mandible and most commonly presents in the third decade of life.

What makes the OKC particularly treacherous is its growth pattern. Early odontogenic keratocysts usually do not display symptoms. Typically, clinical signs and symptoms present with bony expansion or infection. However, bony expansion is uncommon, as odontogenic keratocysts grow due to increased epithelial turnover rather than osmotic pressure. This means a large OKC can expand extensively along the medullary cavity of the jaw with minimal external swelling - making it invisible to clinical examination and detectable only on imaging.

The genetic basis of OKC is also clinically significant. Sporadic and syndromic OKCs are associated with mutations in the gene PTCH found on chromosome 9q, which is part of the Hedgehog signalling pathway. PTCH is a tumour suppressor gene, and loss of its activity leads to a brake in the cell cycle. A third of OKCs show mutations in PTCH, resulting in the cyst epithelium undergoing highly proliferative activity.

Critically, multiple odontogenic keratocysts are a feature, and major diagnostic criterion, of nevoid basal cell carcinoma syndrome (NBCCS, also known as Gorlin-Goltz Syndrome). Almost all individuals with NBCCS have odontogenic keratocysts requiring numerous treatments. Diagnosis of multiple OKCs in a child necessitates referral for genetic evaluation.

3. Ameloblastoma

Ameloblastoma is the second most common odontogenic tumour after odontoma. It can originate from remnants of the dental lamina, the enamel organ, odontogenic cyst lining, or oral mucosa basal cells. It can be either central (intraosseous), which includes multicystic or solid and unicystic, or peripheral (extraosseous).

It typically manifests as a slow-growing, minimises discomfort swelling that may lead to cortical bone bulging, malocclusion, teeth loosening, and potentially severe facial deformities. Despite being classified as benign, the ameloblastoma's behaviour is anything but. Despite being benign and slow-growing, ameloblastomas demonstrate locally damaging characteristics and possess a high recurrence rate.

How Jaw Lesions Are Diagnosed: The Imaging and Biopsy Pathway

Step 1: Panoramic Radiography (OPG) as the First Screen

The orthopantomogram (OPG) remains the entry-level imaging tool for most jaw lesions. It provides a broad survey of both jaws, the temporomandibular joints, and the full dentition in a single exposure. Most jaw cysts and tumours are first detected incidentally on an OPG taken for another purpose - such as wisdom tooth assessment or routine dental review.

The differential diagnosis of jaw lesions can be divided into cystic, neoplastic, and vascular anomalies. Proper clinical assessment along with radiographic and histological evaluation is the mainstay to differentiate between different lesions. A well-defined unilocular appearance is more suggestive of a cystic lesion.

However, the OPG has significant limitations: it cannot reliably distinguish between a dentigerous cyst, an OKC, and a unicystic ameloblastoma - three lesions that can appear radiographically identical and yet require dramatically different surgical treatment.

Step 2: CBCT and CT for Three-Dimensional Assessment

A radiographic examination of any hard tissue lesion is recommended to evaluate the size of the lesion and facilitate procedural planning. Generally, an initial office-based orthopantomogram or cone-beam computed tomography (CBCT) is sufficient. Non-contrast medical-grade computed tomography plays a role in evaluating more extensive or invasive hard tissue lesions.

CBCT has become particularly valuable in oral and maxillofacial pathology. The usefulness of CBCT in detecting osteolysis has been confirmed (sensitivity 89–93%, specificity 60–96.5%). CBCT is more accurate than panoramic radiography and comparable to MRI, CT, and bone scintigraphy. However, CBCT is limited by a poor assessment of soft tissues , which is where MRI becomes essential.

MRI enables the detection of very small lesions, assessment of local spread of the tumour, planning of surgery, and evaluation of complications that can occur during and after surgery.

For suspected malignancy, the imaging stakes are even higher. A study in the American Journal of Roentgenology found that CT correctly revealed 25 of 26 cases with mandibular invasion by squamous cell carcinoma. CT correctly excluded mandibular invasion in 20 of 23 cases without invasion. The diagnostic accuracy of CT for detecting mandibular invasion showed a sensitivity of 96% and specificity of 87%.

Step 3: Biopsy - The Only Definitive Diagnosis

Imaging can characterise a lesion; only histopathology can diagnose it. Clinical and radiographic findings of jaw lesions often lead to a differential diagnosis that only histologic findings will clarify. Dentigerous cyst, keratocystic odontogenic tumour, and certain ameloblastomas that have cystic change may have identical radiographic findings, with only separation by their specific histologic features leading to the significantly different treatments required for each.

The biopsy approach depends on clinical suspicion. An incisional biopsy is recommended when a malignant diagnosis is suspected, as further surgical intervention is usually required. If an excisional biopsy of a lesion suspicious for oral squamous cell carcinoma removes the lesion in its entirety, the consulting oncologist will not know exactly where the lesion was, which can adversely affect medical decision-making.

For large lesions where decompression is planned before definitive surgery, the surgical team usually performs an incisional biopsy during stent placement. This is essential, as the biopsy may prove the lesion to represent an unexpected entity, odontogenic or otherwise, not suitable for decompression.

Surgical Management: From Enucleation to Jaw Resection

The treatment of jaw lesions spans a wide spectrum of surgical complexity. The correct choice depends on lesion type, size, location, relationship to vital structures, and histopathological diagnosis.

Comparative Overview of Surgical Approaches

Enucleation and Curettage

Treatment for the majority of cysts takes the form of simple enucleation, with more complex decompression/marsupialization procedures reserved for larger cysts in which conventional treatment presents a risk of pathological jaw fracture or damage to closely related anatomical structures.

Enucleation - the complete removal of a cyst lining from the surrounding bone - is appropriate for most radicular and dentigerous cysts. For OKCs, however, simple enucleation carries a meaningful recurrence risk because a third of OKCs show mutations in PTCH, resulting in the cyst epithelium undergoing highly proliferative activity, and when removed this favours recurrence if there is incomplete removal of the epithelium. Adjunct treatments including Carnoy's solution (a chemical cauterant applied to the bony cavity) or peripheral ostectomy are typically added to reduce this risk.

Marsupialization and Decompression

For very large cysts - particularly those approaching the inferior alveolar nerve or risking pathological fracture - marsupialization (creating a surgical window that allows the cyst to drain and shrink over time) may precede definitive enucleation. This staged approach reduces the volume of bone that must be sacrificed and allows critical structures to move away from the surgical field.

Resection for Ameloblastoma

The surgical management of ameloblastoma is one of the most clinically debated areas in oral and maxillofacial surgery. The evidence strongly favours radical resection for the conventional solid/multicystic subtype. The recurrence rates for ameloblastoma are reported to be as high as 15–25% after radical treatment and 55–90% after conservative treatment.

A network meta-analysis published in Scientific Reports (2023) found that segmental resection ranked highest for reducing the recurrence rate with the highest SUCRA score (77.7), followed by curettage with cryotherapy (66.9) and marginal resection (49.3).

Many studies have consistently demonstrated that conservative approaches - such as enucleation and curettage - are associated with a substantially higher risk of recurrence, largely due to the infiltrative and often microscopically extensive nature of ameloblastomas. Recurrence rates after conservative treatment can exceed 50%, particularly in multilocular, follicular, and solid/multicystic variants.

If the tumour is aggressive or there is no possibility of combined conservative treatment, radical surgery with 0.5–1 cm of margins is advised with reconstruction, with acceptable outcomes. In the case of solid and multicystic ameloblastoma, the treatment recommended by most authors is radical surgery with margins of 1 cm and resection of adjacent soft tissue with subsequent reconstruction.

Importantly, recurrences in ameloblastoma can occur as long as 10–15 years after treatment , which means long-term radiographic surveillance is non-negotiable regardless of the surgical approach chosen.

Jaw Reconstruction After Resection

When segmental resection is required, jaw reconstruction is planned concurrently (see our guide on Facial Trauma & Jaw Reconstruction: How Oral & Maxillofacial Surgeons Restore Form and Function). The free fibula flap - where a segment of the fibula bone from the lower leg, along with its vascular supply, is transferred to reconstruct the mandible - is the current gold standard for mandibular reconstruction after oncological or pathological resection. Dental implants can subsequently be placed into the reconstructed bone to restore oral function (see our guide on Bone Grafting for Dental Implants: Types, Procedure & How Jaw Bone Loss Is Reversed).

Malignant Jaw Lesions: When the Stakes Are Highest

While the majority of jaw lesions are benign, oral and maxillofacial surgeons must always maintain vigilance for malignancy. Exceptionally rarely, malignant disease of the jaws may present clinically and radiologically as an odontogenic cyst.

Oral squamous cell carcinoma (OSCC) is the most common cancer of the oral cavity and constitutes 95% of all cancers of this area. Advanced tumours can invade the underlying jaw bone, creating radiographic appearances that mimic benign jaw lesions. Squamous cell carcinomas typically manifest as multilocular or unilocular solid lesions with significant bone destruction and invasion of surrounding tissues.

The diagnostic red flags that should prompt urgent specialist referral include:

• A non-healing ulcer or mucosal lesion persisting beyond three weeks
• A jaw radiolucency with irregular or poorly defined margins
• Unexplained tooth mobility not explained by periodontal disease
• Persistent paraesthesia (numbness) of the lip or chin - a potential sign of inferior alveolar nerve involvement
• Rapid growth of any jaw swelling

The low detection rate of early oral squamous cell carcinoma is a considerable clinical issue. Although the oral cavity can be easily examined, in the majority of cases oral SCC is diagnosed in its late stages.

Why Jaw Pathology Requires a Board-Registered Oral & Maxillofacial Surgeon

The diagnosis and management of jaw lesions is not a domain for generalist practice. The critical diagnostic decision - distinguishing a simple dentigerous cyst from an OKC or unicystic ameloblastoma on imaging - directly determines whether a patient undergoes a straightforward enucleation or a jaw resection with free-flap reconstruction. Depending on the histologic diagnosis, the patient may require (1) no further treatment other than simple enucleation in the case of dentigerous cyst, (2) secondary surgical treatment with mandatory long-term radiographic follow-up in the case of keratocystic odontogenic tumour or unicystic ameloblastoma, or (3) even major jaw excision/resection in the case of ameloblastoma.

This clinical decision-making requires the intersection of surgical skill, radiological interpretation, histopathological understanding, and reconstructive capability - precisely the combination that defines the scope of a board-registered oral and maxillofacial surgeon (see our guide on Why Choose a Board-Registered Oral & Maxillofacial Surgeon Over a General Dentist for Complex Procedures).

At Smile Solutions Melbourne, oral and maxillofacial surgeons work within a multidisciplinary environment that enables the full diagnostic and surgical pathway - from initial imaging and biopsy through to reconstruction and implant-based rehabilitation - to be coordinated under one roof.

Key Takeaways

• The most prevalent jaw cysts are radicular cysts (58.6%), dentigerous cysts (17.9%), and odontogenic keratocysts (13.3%)
• all of which require histopathological confirmation to distinguish from one another and from tumours.
• The odontogenic keratocyst is a rare and benign but locally aggressive developmental cyst with a high recurrence rate driven by PTCH gene mutations; its presence in multiples is a diagnostic criterion for Gorlin-Goltz Syndrome.
• Ameloblastoma carries recurrence rates of 15–25% after radical treatment and 55–90% after conservative treatment , making the surgical approach decision one of the most consequential in oral oncology.
• Clinical and radiographic findings of jaw lesions often lead to a differential diagnosis that only histologic findings will clarify
• imaging alone is never sufficient for definitive diagnosis.
• Malignant jaw lesions can mimic benign cysts on imaging; persistent unexplained jaw lesions, non-healing ulcers, or new-onset lip numbness require urgent specialist review.

Conclusion

Oral and maxillofacial pathology occupies a unique clinical space: lesions that are invisible to the naked eye, grow silently within bone, and range from a simple cyst requiring a single surgical visit to an aggressive tumour demanding jaw resection and free-flap reconstruction. The difference between these outcomes is determined by early detection, accurate imaging, definitive histopathological diagnosis, and - critically - the surgical expertise to match treatment to diagnosis.

For patients in Melbourne, an unexplained jaw radiolucency or a referred finding from a general dentist should be evaluated promptly by a board-registered oral and maxillofacial surgeon. Whether the finding proves to be a straightforward dentigerous cyst associated with an impacted wisdom tooth, an aggressive OKC requiring careful long-term surveillance, or something requiring more extensive management, the diagnostic and surgical pathway is the same: specialist-led, imaging-guided, and histopathology-confirmed.

To understand the full scope of what oral and maxillofacial surgeons treat, read our foundational guide: What Is Oral & Maxillofacial Surgery? Scope, Training & Specialist Qualifications Explained. For patients facing bone loss after tooth extraction or tumour resection, see Bone Grafting for Dental Implants: Types, Procedure & How Jaw Bone Loss Is Reversed.

Smile Solutions has been providing oral and maxillofacial surgery care from Melbourne's CBD since 1993. Located at the Manchester Unity Building, Level 12 and Tower, 220 Collins Street, Smile Solutions brings together 60+ clinicians - including 25+ board-registered specialists - who have cared for over 250,000 patients. No referral is required to book a specialist appointment. Call 13 13 96 or visit smilesolutions.com.au to arrange your oral surgery consultation.

References

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• Ikeshima, A. et al. "Comparison of Computed Tomography Findings Between Odontogenic Keratocyst and Ameloblastoma in the Mandible: Criteria for Differential Diagnosis." ScienceDirect, 2022. https://doi.org/10.1016/j.oooo.2022.05.009

• Negreiros Nunes Alves, S.M. et al. "A Network Meta-Analysis Assessing the Effectiveness of Various Radical and Conservative Surgical Approaches Regarding Recurrence in Treating Solid/Multicystic Ameloblastomas." Scientific Reports, 2023. https://doi.org/10.1038/s41598-023-32190-7

• Gümgüm, S. et al. "Controversies in Ameloblastoma Management: Evaluation of Decision Making Based on a Retrospective Analysis." PMC, 2021. https://pmc.ncbi.nlm.nih.gov/articles/PMC7980285/

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• World Health Organization. WHO Classification of Head and Neck Tumours, 5th Edition. International Agency for Research on Cancer, Lyon, 2022. https://tumourclassification.iarc.who.int/