Osteoporosis Pseudoglioma Syndrome

**Semantic type:** Disease or Syndrome

**Definition:** 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.