Alternative definition : NICHD: An autosomal recessive condition caused by homozygous or compound heterozygous
inactivating mutation(s) in the gene LRP5, encoding low-density lipoprotein receptor-related
protein 5. This condition is characterized by severe juvenile-onset osteoporosis and
congenital or juvenile-onset blindness due to a vascularized retinal mass that resembles
a glioma.;