Keratocystic odontogenic tumor

Case contributed by Melbourne Uni Radiology Masters


Jaw discomfort.

Patient Data

Age: 22 years
Gender: Male

Panoramic radiograph (OPG)


There is a lytic benign appearing lesion within the angle of the mandible on the right.

There is well-defined in its outline cirrhotic margins with no cortical breach and no soft tissue mass.

There is no involvement of the adjacent dental anatomy.

There is no unerupted tooth associated with this mandibular cystic lesion.

The appearances are those of a benign lesion probably a keratocystic odontogenic tumor.

CT Mandible


There is a unilocular lytic lesion in the angle of the right hemimandible extending anteriorly from the lateral root of the second molar to the ascending ramus of the mandible posteriorly. The inferior alveolar nerve canal courses along the posterior aspect of the lesion, with a focal area of dehiscence of the canal; it then courses inferior to the canal in the body of the mandible. The internal attenuation is noted of the fluid attenuation. There is no pathological fracture, periosteal reaction or extraosseous tissue extension.

Unremarkable appearance of the remainder of the mandible with enlocated temporomandibular joints. The imaged paranasal sinuses are clear. The pituitary fossa is incompletely imaged and it contains partially imaged adipose tissue. No large mass lesion in the imaged intracranial compartment.

Case Discussion

This case has the differential diagnosis made between a KCOT or a unilocular ameloblastoma

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