Micrognathia - a congenital abnormality of the jaws (particularly the mandible) in which they are unusually small. This condition is not always pathological and may correct itself as the patient matures; however, it may also present as a birth defect in multiple syndromes.
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Source: Data courtesy of the U.S. National Library of Medicine. Since the data might have changed, please query MeSH on Micrognathia for any updates.