Swelling is the most common presenting complaint; however, OKCs may be asymptomatic and found incidentally on dental X-rays.

Malignant transformation to squamous cell carcinoma may occur, but is unusual.

Two thirds of cases are located in the anterior maxilla, and one third are present in the anterior mandible.

Two thirds of the cases are associated with an impacted tooth (usually being the canine).

On radiographs, the adenomatoid odontogenic tumor presents as a radiolucency (dark area) around an unerupted tooth extending past the cementoenamel junction.

It should be differentially diagnosed from a dentigerous cyst and the main difference is that the radiolucency in case of AOT extends apically beyond the cementoenamel junction.

Radiographs will exhibit faint flecks of radiopacities surrounded by a radiolucent zone.

It is sometimes misdiagnosed as a cyst.

Cementoblastoma usually occurs in people under the age of 25, particularly males. It usually involves the permanent mandibular molars or premolars. The involved tooth usually has a vital pulp. It is attached to the tooth root and may cause its resorption, may involve the pulp canal, grows slowly, tends to expand the overlying cortical plates, and, except for the enlargement produced, is usually asymptomatic. This involves the buccal and lingual aspects of the alveolar ridges. But may be associated with diffuse pain and tooth mobility, but the tooth is still vital.

Since a cementoblastoma is a benign neoplasm, it grossly forms a mass of cementum-like tissue as an irregular or round mass attached to the roots of a tooth, usually the permanent mandibular first molar.

Odontogenic myxomas have been found in patients ranging in age between 10 and 50 years, however, they are most commonly diagnosed in young adults (specifically between 25 and 35 years of age). The mandible is more likely to be affected than the maxilla. The region between the molar and premolar is the site of most common occurrence for multilocular lesions while the anterior portion of the mouth favors a smaller, unilocular variety.

Patients afflicted with an odontogenic myxoma generally notice a painless, slowly enlarging expansion of the jaw with possible tooth loosening or displacement. As the tumor expands, it frequently infiltrates adjacent structures. Maxillary lesions frequently enter the sinuses while mandibular tumors often extend into the ramus.

A cementoblastoma in a radiograph appears as a well-defined, markedly radiopaque mass, with a radiolucent peripheral line, which overlies and obliterates the tooth root. it is described as having a rounded or sunburst appearance. There is usually apparent external resorption of the root where the tumor and the root join. Severe hypercementosis and chronic focal sclerosing osteomyelitis are lesions to consider in the differential diagnosis of this lesion.

Radiographically, odontogenic myxomas appear most commonly as multilocular radiolucencies with ill-defined borders, though unilocular cyst-like tumors can occur, especially when associated with impacted teeth or when discovered in childhood. Ideally, the septa that cause the multilocular feature are thin and straight, producing a tennis racket or stepladder pattern. In reality, the majority of the septa visible in the tumor are curved and coarse, causing a "soap bubble" or "honeycomb" appearance, though locating one or two straight septa can aide in the diagnosis of this tumor.

Four types of cementomas are described :

- Benign cementoblastoma

- Periapical cemental dysplasia

- Multiple apical cementomas

- Gigantiform cementoma

The central odontogenic fibroma is a rare benign odontogenic tumor. It is more common in adults, with the average age being 40. It is twice as likely to affect women than men. It is usually found either in the anterior maxilla or the posterior mandible. Radiographically it presents with either radiolucency or mixed radiolucency/opaque. The simple type is characterized by delicate fibrillar stroma of collagen containing fibroblasts; the WHO type is characterized by more mature fibrillar stroma of collagen. Treatment is by surgical removal

It is fairly uncommon, but It is seen more in young people. Two thirds of the cases are found in females.

An odontogenic tumor is a neoplasm of the cells or tissues that initiate odontogenic processes.

Examples include:

- Adenomatoid odontogenic tumor

- Ameloblastoma, a type of odontogenic tumor involving ameloblasts

- Calcifying epithelial odontogenic tumor

- Keratocystic odontogenic tumor

- Odontogenic myxoma

- Odontoma

frequency:- rare type of cyst

It can occur at any age, mostly between 2nd and 3rd decade of life.

Diameter is 2 to 4 cm

swelling pain maybe present.

intra bony expansions may produce hard bony expansion.

may perforate cortical bones

also it extends to soft tissue

maybe asymptomatic

The squamous odontogenic tumor is a rare odontogenic tumor found in any area of the alveolar bone. Usually, there is a painless swelling with adjacent teeth becoming mobile. On radiographs, it presents as a radiolucency (dark area) between the teeth in a triangular shape. Clinically, it may present similar to periodontal disease.

Cementoma is an odontogenic tumor of cementum. It usually occurs after root development is finished, found predominantly in African American women older than 40. It is found most commonly in the mandible in the region of the lower molar teeth. It causes distortion of surrounding areas but is a usually painless growth, at least initially. Considerable thickening of the cementum can often be observed. A periapical form is also recognized.

The calcifying odotogenic cyst or the Gorlin cyst, now known in the WHO Classification of Tumours as the calcifying cystic odontogenic tumor, is a benign odontogenic tumor of cystic type most likely to affect the anterior areas of the jaws. It is most common in people in their second to third decades but can be seen at almost any age. On radiographs, the calcifying odontogenic cyst appears as a unilocular radiolucency (dark area). In one-third of cases, an impacted tooth is involved. Microscopically, there are many cells that are described as "ghost cells", enlarged eosinophilic epithelial cells without nuclei.

CGCG lesions are found more commonly in the anterior of the maxilla and the mandible in younger people (before age 20). They are characterized by large lesions that expand the cortical plate and can resorb roots and move teeth. They are composed of multi-nucleated giant cells. CGCG has a slight predilection for females.

Radiographically :

It appears as multilocular radiolucencies of bone.The margin of the lesion has scalloped appearance and is well demarcated. Resorption and divergence of roots is also seen.

There are two types of CGCG's, non-aggressive and aggressive. The former has a slow rate of growth and thus less likely to resorb roots and perforate the cortical plate. The aggressive form has rapid growth and thus is much more likely to resorb roots and perforate the cortical plate. It also has a high rate for recurrence and can be painful and cause paresthesia.

Differential diagnosis to include: odontogenic keratocyst (OKC), ameloblastoma, odontogenic myxoma, hemangioma, central odontogenic fibroma, hyperparathyroid tumor, and cherubism.

There are two main types: compound and complex.

- A "compound" odontoma still has the three separate dental tissues (enamel, dentin and cementum), but may present a lobulated appearance where there is no definitive demarcation of separate tissues between the individual "toothlets" (or denticles). It usually appears in the anterior maxilla.

- The "complex" type is unrecognizable as dental tissues, usually presenting as a radioopaque area with varying densities. It usually appears in the posterior maxilla or in the mandible.

In addition to the above forms, the dilated odontoma is an infrequent developmental alteration that appears in any area of the dental arches and can affect deciduous, permanent and supernumerary teeth. Dens invaginatus is a developmental anomaly resulting from invagination of a portion of crown forming within the enamel organ during odontogenesis. The most extreme form of dens invaginatus is known as dilated odontoma.

Most cysts in the body are benign (dysfunctional) tumors, the result of plugged ducts or other natural body outlets for secretions. However, sometimes these masses are considered neoplasm:

- Keratocyst

- Calcifying odotogenic cyst

- According to the current (2005) classification of the World Health Organization, both (parakeratizied) odontogenic keratocyst and calcifying odotogenic cyst have neoplastic characteristics, thus renamed as Keratocystic odontogenic tumor and Calcifying odotogenic tumor, respectively.

- Cystic ameloblastoma

- Long standing dentigerous cyst, odontogenic keratocyst, and residual cyst may have neoplastic potential converting into the locally aggressive ameloblastoma, or the malignant squamous cell carcinoma and mucoepidermoid carcinoma.

The peripheral odontogenic fibroma is an uncommon gingival mass. It affects people across a large age range. It can be confused with the peripheral ossifying fibroma. In contrast to the peripheral ossifying fibroma, the peripheral odontogenic fibroma is a rare lesion.

No specific gender predilection while the ages of the patients ranged from 5 to 65 years.commonly seen in mandible than maxilla.

slow growing, solid, firmly attached gingival mass sometimes arising between teeth and sometimes displacing teeth.

consists of cellular fibrous connective tissue parenchyma with non neoplastic islands, strands of clouman or cuboidal odontogenic epithelium.

Patients typically present with swelling with or without pain. The slow-growing tumor predominantly arises in long bones in a subcortical location (95% in the tibia or fibula). Most commonly, patients are in their second or third decade, but adamantinoma can occur over a wide age range.

Benign osteofibrous dysplasia may be a precursor of adamantinoma or a regressive phase of adamantinoma.

Histologically, islands of epithelial cells are found in a fibrous stroma. The tumor is typically well-demarcated, osteolytic and eccentric, with cystic zones resembling soap bubbles.

Central giant-cell granuloma (CGCG) is a benign condition of the jaws. It is twice as likely to affect women and is more likely to occur in 20- to 40-year-old people. Central giant-cell granulomas are more common in the mandible and often cross the midline.

Odontogenic cyst are a group of jaw cysts that are formed from tissues involved in odontogenesis (tooth development). Odontogenic cysts are closed sacs, and have a distinct membrane derived from rests of odontogenic epithelium. It may contain air, fluids, or semi-solid material. Intra-bony cysts are most common in the jaws, because the mandible and maxilla are the only bones with epithelial components. That odontogenic epithelium is critical in normal tooth development. However, epithelial rests may be the origin for the cyst lining later.

Not all oral cysts are odontogenic cyst. For example, mucous cyst of the oral mucosa and nasolabial duct cyst are not of odontogenic origin.

In addition, there are several conditions with so-called (radiographic) 'pseudocystic appearance' in jaws; ranging from anatomic variants such as Stafne static bone cyst, to the aggressive aneurysmal bone cyst.

An odontoma (also termed odontome) is a benign tumour of odontogenic origin (i.e. linked to tooth development). Specifically, it is a dental hamartoma, meaning that it is composed of normal dental tissue that has grown in an irregular way.

The average age of people found with an odontoma is 14. The condition is frequently associated with one or more unerupted teeth. Though most cases are found impacted within the jaw there are instances where odontomas have erupted into the oral cavity.

The glandular odontogenic cyst is a rare odontogenic cyst. In 85% of cases, it is found in the mandible, especially in anterior areas. It is more common in adults in their fifth and sixth decades. On radiographs, it can appear as a unilocular or multilocular radiolucency (dark area). Since the glandular odontogenic cyst can range in size, treatment can be as simple as enucleation and curettage to en bloc resection of the affected jaw.

Ameloblastomas are often associated with the presence of unerupted teeth. Symptoms include painless swelling, facial deformity if severe enough, pain if the swelling impinges on other structures, loose teeth, ulcers, and periodontal (gum) disease. Lesions will occur in the mandible and maxilla, although 75% occur in the ascending ramus area and will result in extensive and grotesque deformities of the mandible and maxilla. In the maxilla it can extend into the maxillary sinus and floor of the nose. The lesion has a tendency to expand the bony cortices because slow growth rate of the lesion allows time for periosteum to develop thin shell of bone ahead of the expanding lesion. This shell of bone cracks when palpated and this phenomenon is referred to as "Egg Shell Cracking" or crepitus, an important diagnostic feature. Ameloblastoma is tentatively diagnosed through radiographic examination and must be confirmed by histological examination (e.g., biopsy).