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Laterognathia (hemi-mandibular elongation) The characteristic of hemi mandibular hyperplasia is facial asymmetry (oversized lower face on one side). Hemimandibular hyperplasia (HH) is a developmental asymmetry characterized by three-dimensional enla. Hemimandibular hyperplasia is a developmental asymmetry characterized by three-dimensional enlargement of half of the mandible.6 The hyperplastic side.

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Bone scanning, a tracer method based on the injection of phosphates labeled with a radionuclide, is a noninvasive technique to evaluate whether the condylar growth is still active. Facial profile – left side Click here to view.

Hemimandibular hyperplasia–hemimandibular elongation.

Therefore, this entity could be theoretically arrested by the removal of the cartilage. The panoramic radiograph demonstrates readaptation of the condyle in the fossa Fig 1g. Lateral Cephalogram Click here to view.

Many treatment options exist for this type of condition. The authors present their experience on the basis of this proposed classification and treatment algorithm with functional and aesthetic outcomes as the end points of this study. Fig 1f Patient’s frontal view 12 years after the operation.

AO Surgery Reference

It is a condition without a definitive etiology. There are two basically different malformations hyperolasia one side of the mandible which we call hemimandibular hyperplasia and hemimandibular elongation hemimaandibular.

Severe facial asymmetry is evident. It is important to observe that in this case, as in others described in the literature, 8,9 the pathosis also involves the maxilla with maxillary monolateral vertical growth, including the maxillary sinus. Fig 2c Posteroanterior cephalogram of the patient showing the inferior displacement of the mandibular angle and the ipsilateral compensatory maxillary growth.


From a histologic point of view, the affected condyle is covered by a very broad layer of fibrocartilage. Fig 2a Patient’s preoperative frontal view.

How to cite this URL: Few reports are available regarding the long-term follow-up of patients affected by HH who have undergone early high condylectomy. In this study, the authors classified the patients into typical and atypical types of HH on the basis of clinical and radiologic observations in an effort to achieve a simplified and efficient surgical management on the basis of the severity of deformity.

Views Read Edit View history. Fig 2f Posteroanterior cephalogram showing the skeletal symmetry after orthognathic surgery.

PA cephalometry, panoramic radiograph, and nuclear imaging are some of the techniques that can be used for diagnosis. In the case of young patients with HH, this procedure should be performed as soon as possible to prevent the development of an hyperpllasia occlusal plane and ipsilateral compensatory maxillary growth 9—12 and to improve symmetry by the spontaneous remodeling processes in the facial hyperplzsia.

This is always manifested in the premolar and molar area.

A diverse experience with 18 patients”. The chin is shifted to the normal side. The etiology of HH is still under discussion. Normally, the dental midline is deviated toward the hypefplasia side but may also be centered, depending on the vector and speed of growth.


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Hemimandibular hyperplasia was clearly described by Obwegeser and Makek 2 and must be distinguished from solitary and exclusive hyperplasia of the condyle. In the literature, various surgical treatments have been proposed condylectomy, condylar shave, orthognathic surgery, etcdepending on the patient’s age, the presence of active or inactive condylar growth, and the severity of facial appearance.

Condylar hyperplasia mandibular heminandibular is over-enlargement of the mandible bone in the skull.

In fact, if surgery is delayed until the end of growth, the surgeon will be unable to take advantage of the spontaneous remodeling of the tissues obtained during growth with a single condylectomy. Fig 1b Patient’s preoperative dental occlusion showing a Class II division 2 malocclusion deep bitebut the dental midline is centered. The ascending ramus is elongated, and this is expressed by the enlargement of the condyle and the elongation and thickening of the condylar neck.


The present year follow-up demonstrates that, in this case, condylar surgery was a simple and straightforward decision. Acquired asymmetries occur as a result of traumas, infections, functional shifts and tumors. The cells are large, the cytoplasm is vesicular, and there is abundant newly produced cartilage matrix between cells.