BNAR syndrome is an autosomal recessive condition of nasal anomalies associated with renal and anorectal malformations. Patients have renal agenesis, anorectal malformations ranging from anteriorly placed anus with stenosis to rectal atresia, and overlapping toes. The syndrome is caused by mutations in FREM1 that encodes an extracellular matrix component of basement membranes.
