Familial homozygous hypercholesterolemia: report of two patients and review of the literature.

Familial homozygous hypercholesterolemia is a rare autosomal dominant, metabolic disorder caused by mutation in the gene, which encodes the synthesis of low-density lipoprotein receptors and is characterized by increased serum low-density lipoprotein cholesterol. Multiple types of xanthomas occur, such as tendinous, tuberous, xanthelasma, and sub-periosteal. Intertriginous xanthomas are rare but if present are pathognomonic of this disorder.