SNOMED CT, US Edition

Last uploaded: March 22, 2026
Id http://purl.bioontology.org/ontology/SNOMEDCT/699298009
http://purl.bioontology.org/ontology/SNOMEDCT/699298009
Preferred Name

Ohdo syndrome, Say-Barber-Biesecker-Young-Simpson variant

Definitions
A rare, genetic, multiple congenital anomalies syndrome characterized by the association of a typical facial phenotype with microcephaly associated with congenital hypothyroidism, skeletal involvement (polydactyly, long thumb(s) and long first toe(s), and patellar hypoplasia/agenesis), and some degree of global developmental delay, hypotonia and intellectual disability. Facial features include an immobile mask-like face, severe blepharophimosis and ptosis, tear duct abnormalities, a broad nasal bridge, bulbous nasal tip, small mouth, thin upper lip, hypoplastic teeth and small, low set ears. Renal and genital anomalies, usually cryptorchidism, are often present in affected males. Congenital heart defects and growth delay are variably present. A rare, genetic, multiple congenital anomalies syndrome characterised by the association of a typical facial phenotype with microcephaly associated with congenital hypothyroidism, skeletal involvement (polydactyly, long thumb(s) and long first toe(s), and patellar hypoplasia/agenesis), and some degree of global developmental delay, hypotonia and intellectual disability. Facial features include an immobile mask-like face, severe blepharophimosis and ptosis, tear duct abnormalities, a broad nasal bridge, bulbous nasal tip, small mouth, thin upper lip, hypoplastic teeth and small, low set ears. Renal and genital anomalies, usually cryptorchidism, are often present in affected males. Congenital heart defects and growth delay are variably present. Rare syndrome with the association of congenital hypothyroidism, facial dysmorphism (microcephaly, blepharophimosis, a bulbous nose, thin lip, low-set ears and micrognathia), postaxial polydactyly and severe intellectual deficit. Cryptorchidism is present in affected males. Some patients also have cardiac anomalies (interventricular communication), hypotonia and growth delay.
Synonyms
Young-Simpson syndrome
Say-Barber-Biesecker-Young-Simpson variant of Ohdo syndrome
Hypothyroidism, dysmorphism, postaxial polydactyly, intellectual disability syndrome
Blepharophimosis, intellectual disability syndrome, Say-Barber-Biesecker-Young-Simpson type
Blepharophimosis, intellectual disability syndrome, Say-Barber-Biesecker-Young-Simpson type (disorder)
Say-Barber-Biesecker-Young-Simpson syndrome
Blepharophimosis-intellectual deficit syndrome, Say-Barber/Biesecker/Young-Simpson type
Type http://www.w3.org/2002/07/owl#Class
Delete Subject Author Type Created
No notes to display