Condylar Hyperplasia

By Dr. Vishaal Bhat on Friday, April 11, 2008 with 0 comments

A disorder of unknown etiology characterized by persistent or accelerated growth of the condyle when growth should be slowing or ended.

Slowly progressive unilateral enlargement of the head and neck of the condyle causes crossbite malocclusion, facial asymmetry, and shifting of the midpoint of the chin to the unaffected side. The patient may appear prognathic. The lower border of the mandible is often convex on the affected side. On x-ray, the TMJ may appear normal, or the condyle may be symmetrically enlarged and the mandibular neck elongated. Growth eventually stops on its own.

Chondroma and osteochondroma may produce similar symptoms and signs, but they grow more rapidly and may cause even greater asymmetric condylar enlargement. These conditions must be ruled out, usually by x-rays or CT scans to determine if growth is localized to part of the condylar head or is more generalized. If growth is localized, a biopsy may be performed to distinguish between tumor and hyperplasia.


Treatment usually includes condylectomy during the period of active growth. If growth has stopped, orthodontics and surgical mandibular repositioning are indicated. If the height of the mandibular body is greatly increased, facial symmetry can be further improved by reducing the inferior border.

Category: Oral Medicine Notes



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