dahlberg borer newcomer syndrome dahlberg borer newcomer syndrome dahlberg borer newcomer syndrome is a rare autosomal x-linked recessive genetic condition characterized by a prolapse of the bicuspid valve, progressive kidney failure, congenital lymphedema, hypoparathyroidism, and very short end bones of fingers. dahlberg borer newcomer syndromeother nameslymphedema hypoparathyroidism syndrome, hypoparathyroidism lymphedema syndrome, dahlberg syndrome. treatments treatment for this condition is based on its symptoms. these treatments may include manual lymphatic drainage, consumption of beta blockers or anticoagulants for the bicuspid valve prolapse and vitamin d or calcium carbonate tablets for the hypoparathyroidism.