Congenital Microstomia - Feature of craniofacial syndromes - Including Freeman-Sheldon syndrome - Also seen in Sheldon-Hall syndromes - May present with whistling-face feature - Impairs alimentation and may require oral surgeries

Acquired Microstomia - Can result from scarring due to various conditions - Seen as a complication of facial burns - Can be a feature of systemic scleroderma

References - Hagberg and Benumofs Airway Management, Elsevier, pp. 608-639 - Jameson, J. Larry, Harrisons Principles of Internal Medicine, McGraw-Hill Education, pp. ch 353

External links - Classification: ICD-10: Q18.5 - Classification: ICD-9-CM: 744.84