True hemifacial hypertrophy: unilateral enlargement of all tissues, teeth, bones, and soft tissues,
In partial hemifacial hypertrophy not all structures are enlarged to the same degree or limited to one structure
Characterized by viscerocranial enlargement, bounded by frontal bone superiorly (sparing the eye), inferior border of the mandible inferiorly, midline medially, and ear including the pinna laterally
Isolated hemifacial hypertrophy should be a diagnosis of exclusion, because there are other more clinically burdensome conditions that can cause facial asymmetry. These conditions include the following: Proteus syndrome, BWS, NF1, and vascular malformations such as Klippel Trenaunay syndrome and lymphaticovenous malformations
