This is a rare but not uncommon entity where there is long-term overgrowth of one of both the jaw joints. Facial asymmetry may develop which can be quite obvious in many cases. Associated symptoms may be pain and dysfunction with difficulty eating and yawning.
Diagnosis depends on history, heteroanamnesis, past imaging and records, bone scans. A definitive diagnosis is often made over a defined time period.
Patients have often seen multiple doctors and can present with pain in both sides. Often, the will have noticed an asymmetry of the face for many years.
A telling radiological feature is an enlarged condyle on one side and degeneration on the other.
Condylar Hyperplasia on OPG - Note the difference in heights in the left and right sides of the joints
A 3D image demonstrating condylar hyperplasia with the chin deviating to the contralateral side.
Note the asymmetry of the face
Treatment involves making an appropriate diagnosis in the first instance with various combintations of surgical treatments most frequently in the form of a "high condylar shave" which removes the top aspect of the jaw joint eliminating the growth centre.