Hemifacial hypertrophy (also termed facial hemihypertrophy,[2] facial hemihyperplasia,[2] or Friedreich's disease)[3] abbreviated as (HFH) is rare congenital disease characterized by unilateral enlargement of the head and teeth.

[4][5] It is classified as true HFH (THFH) with unilateral enlargement of the viscerocranium, and partial HFH (PHFH) in which not all structures are enlarged.

Hemifacial hypertrophy can cause a wide spectrum of defects or may involve only muscle or bone.

[6] It is believed to be a minor form of hemihypertrophy.

[7] This genetic disorder article is a stub.