What is "microstomia"

n. (context medicine English) The presence of an abnormally small mouth, a clinical feature of many craniofacial syndromes.

Microstomia (micro- a combining form meaning small + -stomia a combining form meaning mouth = (abnormally) "small mouth") 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.