<unk>  (YSS) is a rare congenital disorder with symptoms including hypothyroidism, heart defects, facial dysmorphism, cryptorchidism in males, hypotonia, mental retardation and postnatal growth retardation. Other symptoms include transient hypothyroidism, macular degeneration and torticollis. The condition was discovered in 1987 and the name arose from the individuals who first reported the syndrome. An individual with YSS has been identified with having symptoms to a similar syndrome known as Ohdo Blepharophimosis syndrome, showing that it is quite difficult to diagnose the correct condition based on the symptoms present. Some doctors therefore consider these syndromes to be the same.
Young–Simpson syndrome
Antley–Bixler syndrome
Witteveen–Kolk syndrome
Grisel's syndrome
Havana syndrome
Michels Caskey syndrome
Bogart–Bacall syndrome
Fowler's syndrome