Table 2. A Classification System Modified by Kaban et al to Capture the Craniofacial Microsomia-Related Mandibular Hypoplasia and Temporomandibular Joint (TMJ) Deformity Observed on Cephalograms.

I	Small mandible
IIA	Short mandibular ramus of abnormal shape; glenoid fossa in satisfactory position
IIB	TMJ abnormally placed inferiorly, medially and anteriorly
III	Absent TMJ

Kaban's modification of the Pruzansky classification system. (From Kaban LB, Moses MH, Mulliken JB. Surgical correction of hemifacial microsomia in the growing child. Plast Reconstr Surg 1988; 82:9–19.)