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|Classification and external resources|
Microstomia (micro- a combining form meaning small + -stomia a combining form meaning mouth = (abnormally) "small mouth" in Greek) is a clinical feature of many craniofacial syndromes, including Freeman-Sheldon syndrome and Sheldon-Hall syndromes (or distal arthrogryposis multiplex congenita). It may present with whistling-face feature, as well, as in Freeman-Sheldon syndrome. In this syndrome, it impairs alimentation and may require repeated oral surgeries (called commissurotomy) to improve function. It can also be a feature of systemic scleroderma.