Odontogenic Cyst: Understanding Your Pathology Report

by Jason Wasserman MD PhD FRCPC
May 3, 2026

An odontogenic cyst is a noncancerous, fluid-filled growth that develops within the bones of the jaw — the mandible (lower jaw) and the maxilla (upper jaw). The word “odontogenic” means “tooth-producing”: these cysts arise from cells originally involved in tooth development. Most odontogenic cysts are benign and grow slowly, but they can become large enough to damage the surrounding bone, displace teeth, or weaken the jaw if not removed.

This article is an overview of odontogenic cysts as a group. It will help you understand the broad category before turning to the specific type identified in your pathology report — what each term means and why it matters for your care.

How do odontogenic cysts form?

To understand odontogenic cysts, it helps to know how teeth develop. Teeth begin forming in the jaws long before birth and continue to form into the teenage years. During this process, several specialized cell groups are responsible for shaping the tooth crown, forming the root, and connecting the tooth to the surrounding bone. After a tooth is fully formed, small clusters of these cells often remain trapped within the jaw — this is normal and happens in everyone. In most people they sit quietly and never cause a problem. In some people, however, these leftover cells start to multiply and produce fluid, gradually forming a hollow space lined by a thin layer of cells: an odontogenic cyst.

Pathologists divide odontogenic cysts into two main groups based on what triggers the leftover cells to start growing:

Inflammatory cysts — Triggered by chronic infection or inflammation, almost always related to a tooth that has died from decay or injury. The radicular cyst is by far the most common example.
Developmental cysts — Triggered by abnormal behavior of the leftover cells themselves, with no preceding infection. The dentigerous cyst, odontogenic keratocyst, and several rarer types fall into this group.

This distinction matters because the two groups behave differently, are managed differently, and carry different long-term risks.

What are the most common types of odontogenic cysts?

The five most commonly encountered types are described briefly below. Each has its own dedicated article on this site with more detailed information.

Radicular cyst (also called periapical cyst) — The most common odontogenic cyst overall. It develops at the tip of a tooth root in response to a long-standing infection of the tooth pulp, usually due to deep decay or injury. It is an inflammatory cyst.
Dentigerous cyst (also called follicular cyst) — The second most common odontogenic cyst. It forms around the crown of an unerupted tooth, most often a lower wisdom tooth. It is a developmental cyst.
Odontogenic keratocyst (OKC) — A developmental cyst with a distinctive microscopic appearance and a relatively high tendency to recur after surgery. It can be associated with a genetic condition called nevoid basal cell carcinoma syndrome (Gorlin syndrome) when multiple cysts are present.
Eruption cyst — A soft-tissue developmental cyst that forms in the gum directly over an erupting tooth, most often in young children. It usually disappears on its own as the tooth comes through.
Lateral periodontal cyst — An uncommon developmental cyst that forms along the side of a tooth root rather than at the tip. Most often found in the lower jaw between the canine and premolar teeth.

Several rarer types also exist, including the calcifying odontogenic cyst (also called Gorlin cyst, characterized by the presence of “ghost cells” — pale cells that have lost their nuclei but kept their outline), the glandular odontogenic cyst (which can behave aggressively and recur), the orthokeratinized odontogenic cyst (which looks similar to OKC but behaves much less aggressively), the buccal bifurcation cyst (seen in children, near the roots of the lower molars), and the residual cyst (a radicular cyst that has persisted after the original tooth was removed).

How is the diagnosis made?

The diagnosis is made after a tissue sample is examined under the microscope by a pathologist. An odontogenic cyst is usually first suspected on a dental X-ray, panoramic X-ray, or cone-beam CT, which shows a well-defined dark area within the bone of the jaw. The exact appearance and location often suggest a specific type of cyst — for example, a dark area at the tip of a decayed tooth root strongly suggests a radicular cyst, while a dark area surrounding the crown of an unerupted wisdom tooth suggests a dentigerous cyst. Imaging alone, however, cannot reliably distinguish among the various types of odontogenic cysts or from other jaw lesions, such as ameloblastoma. The cyst is removed by an oral and maxillofacial surgeon (and often by a general dentist or endodontist for radicular cysts) and sent to the laboratory.

Under the microscope, the pathologist looks for an open space (the cyst cavity) lined by a layer of epithelial cells. The exact appearance of the lining is what tells the pathologist which type of cyst it is — the thin, uniform squamous epithelium of a radicular or dentigerous cyst is very different from the corrugated, parakeratinized lining of an OKC, and different again from the ameloblastoma-like lining with ghost cells found in a calcifying odontogenic cyst. The pathology report will name the specific type of cyst found and any clinically significant features — such as inflammation, atypia, or evidence of an associated tumor.

Can an odontogenic cyst be cancerous?

The great majority of odontogenic cysts are benign and stay benign. They do not invade surrounding tissue or spread to other parts of the body. However, three nuances are worth understanding:

OKC and calcifying odontogenic cyst sit on the borderline between cyst and tumor — Both are classified as cysts in the current World Health Organization (WHO) classification, but both have growth behavior more aggressive than a simple cyst. OKC was even renamed “keratocystic odontogenic tumor” between 2005 and 2017 before being reclassified as a cyst again. They are still benign, but they require more careful surgery and longer follow-up than other odontogenic cysts.
Cancer rarely arises from the lining of an odontogenic cyst — Reports exist of ameloblastoma and, even more rarely, squamous cell carcinoma developing from the lining of a long-standing dentigerous cyst or OKC. This is uncommon, but it is one of the reasons pathologists carefully examine the entire cyst wall under the microscope rather than relying on a small sample.
The glandular odontogenic cyst is the most aggressive type — It has a relatively high recurrence rate and shares some microscopic features with a low-grade salivary-type cancer that can arise in the same area. For this reason, it is treated more aggressively than other odontogenic cysts.

What is the prognosis?

The outlook for most odontogenic cysts is excellent. Once the cyst is completely removed and any underlying problem (such as a dead tooth) is addressed, the bone almost always fills in completely over the following 6 to 12 months. Recurrence is uncommon for radicular and dentigerous cysts. Recurrence rates are higher for OKC, calcifying odontogenic cyst, and glandular odontogenic cyst, which is why long-term imaging follow-up is recommended for these specific types. Detailed prognostic information is provided in the dedicated article for each type.

What happens after the diagnosis?

Treatment depends on the specific type of cyst and is led by an oral and maxillofacial surgeon, a general dentist, or an endodontist, depending on the situation. The general principles are the same across most types:

Remove the cyst — Most odontogenic cysts are treated by enucleation, in which the cyst is scooped out of the bone in one piece. Larger cysts may first be marsupialized (opened to the mouth and allowed to slowly shrink) before final removal.
Address the underlying tooth problem — For inflammatory cysts, this means treating or removing the affected tooth. For developmental cysts, the associated unerupted tooth is usually removed at the same operation, although it may be preserved in selected cases — particularly in younger patients.
Follow up with imaging — X-rays at 6 and 12 months are typical. Long-term follow-up is more important for the more aggressive types (OKC, calcifying odontogenic cyst, glandular odontogenic cyst), where late recurrence is well documented.
Replace lost teeth as needed — Dental rehabilitation with implants, bridges, or orthodontic treatment can usually be planned once the bone has healed.

Questions to ask your doctor

Which specific type of odontogenic cyst do I have?
Is it an inflammatory cyst or a developmental cyst, and what does that mean for my treatment?
Was the entire cyst removed?
Did the pathology report identify any unusual features, such as atypia or evidence of a tumor in the cyst lining?
What is the chance of this cyst coming back?
Should I be tested for any genetic condition (such as Gorlin syndrome if I have an OKC)?
What is the schedule for follow-up X-rays, and how long will it continue?
Were any teeth removed, and what are my options for replacing them?
Will I have any lasting numbness or changes in my bite?
Are there any preventive steps I can take to reduce the chance of another cyst forming?