| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group | 
| Baller-Gerold syndrome | Associated morphology | True | Premature fusion | Inferred relationship | Some | 2 | 
| Acrocephalosyndactyly type V (disorder) | Associated morphology | True | Premature fusion | Inferred relationship | Some | 1 | 
| Saethre-Chotzen syndrome | Associated morphology | True | Premature fusion | Inferred relationship | Some | 1 | 
| Dolichocephalic dwarfism | Associated morphology | True | Premature fusion | Inferred relationship | Some | 1 | 
| Trigonocephaly | Associated morphology | True | Premature fusion | Inferred relationship | Some | 2 | 
| Crouzon syndrome | Associated morphology | True | Premature fusion | Inferred relationship | Some | 2 | 
| Anterior perimaxillary faciosynostosis | Associated morphology | True | Premature fusion | Inferred relationship | Some | 1 | 
| Complete perimaxillary faciosynostosis | Associated morphology | True | Premature fusion | Inferred relationship | Some | 1 | 
| Posterior perimaxillary faciosynostosis | Associated morphology | True | Premature fusion | Inferred relationship | Some | 1 | 
| Vomero-premaxillary faciosynostosis | Associated morphology | True | Premature fusion | Inferred relationship | Some | 1 | 
| Vomero-premaxillary faciosynostosis | Associated morphology | True | Premature fusion | Inferred relationship | Some | 2 | 
| Interfrontal craniofaciosynostosis | Associated morphology | True | Premature fusion | Inferred relationship | Some | 2 | 
| Acrocephalosyndactyly type I | Associated morphology | True | Premature fusion | Inferred relationship | Some | 1 | 
| Acrocephalopolysyndactyly | Associated morphology | True | Premature fusion | Inferred relationship | Some | 1 | 
| Unicoronal craniosynostosis | Associated morphology | True | Premature fusion | Inferred relationship | Some | 1 | 
| Bicoronal craniosynostosis | Associated morphology | True | Premature fusion | Inferred relationship | Some | 1 | 
| Premature closure of foramen ovale | Associated morphology | True | Premature fusion | Inferred relationship | Some | 1 | 
| Fibroblast growth factor receptor 3-related craniosynostosis (disorder) | Associated morphology | True | Premature fusion | Inferred relationship | Some | 1 | 
| Acrocephalopolysyndactyly type II (disorder) | Associated morphology | True | Premature fusion | Inferred relationship | Some | 2 | 
| Acrocephalopolysyndactyly type III (disorder) | Associated morphology | True | Premature fusion | Inferred relationship | Some | 1 | 
| Crouzon syndrome with acanthosis nigricans (disorder) | Associated morphology | True | Premature fusion | Inferred relationship | Some | 3 | 
| Cutis gyrata syndrome of Beare and Stevenson | Associated morphology | True | Premature fusion | Inferred relationship | Some | 2 | 
| Complex craniosynostosis | Associated morphology | True | Premature fusion | Inferred relationship | Some | 1 | 
| Simple craniosynostosis | Associated morphology | True | Premature fusion | Inferred relationship | Some | 1 | 
| Craniosynostosis Herrmann Opitz type (disorder) | Associated morphology | True | Premature fusion | Inferred relationship | Some | 1 | 
| Craniosynostosis and dental anomalies syndrome | Associated morphology | True | Premature fusion | Inferred relationship | Some | 2 | 
| Lethal occipital encephalocele, skeletal dysplasia syndrome (disorder) | Associated morphology | True | Premature fusion | Inferred relationship | Some | 2 | 
| Long narrow head | Associated morphology | True | Premature fusion | Inferred relationship | Some | 1 | 
| Cloverleaf skull with multiple congenital anomalies syndrome (disorder) | Associated morphology | True | Premature fusion | Inferred relationship | Some | 1 | 
| Cloverleaf skull with multiple congenital anomalies syndrome (disorder) | Associated morphology | True | Premature fusion | Inferred relationship | Some | 4 | 
| Cloverleaf skull with multiple congenital anomalies syndrome (disorder) | Associated morphology | True | Premature fusion | Inferred relationship | Some | 5 | 
| Spondyloepiphyseal dysplasia, craniosynostosis, cleft palate, cataract and intellectual disability syndrome (disorder) | Associated morphology | True | Premature fusion | Inferred relationship | Some | 4 | 
| Shprintzen Goldberg craniosynostosis syndrome (disorder) | Associated morphology | True | Premature fusion | Inferred relationship | Some | 1 | 
| Trigonocephaly with bifid nose and acral anomaly syndrome (disorder) | Associated morphology | True | Premature fusion | Inferred relationship | Some | 2 | 
| Trigonocephaly with broad thumb syndrome (disorder) | Associated morphology | True | Premature fusion | Inferred relationship | Some | 2 | 
| Cardiocranial syndrome Pfeiffer type (disorder) | Associated morphology | True | Premature fusion | Inferred relationship | Some | 1 | 
| Craniofacial dyssynostosis syndrome (disorder) | Associated morphology | True | Premature fusion | Inferred relationship | Some | 3 | 
| Craniofrontonasal dysplasia with Poland anomaly syndrome (disorder) | Associated morphology | True | Premature fusion | Inferred relationship | Some | 1 | 
| Craniosynostosis, anal anomaly, porokeratosis syndrome (disorder) | Associated morphology | True | Premature fusion | Inferred relationship | Some | 2 | 
| Craniosynostosis with Dandy-Walker malformation and hydrocephalus syndrome (disorder) | Associated morphology | True | Premature fusion | Inferred relationship | Some | 1 | 
| Capra DeMarco syndrome (disorder) | Associated morphology | True | Premature fusion | Inferred relationship | Some | 4 | 
| Craniosynostosis and intracranial calcification syndrome (disorder) | Associated morphology | True | Premature fusion | Inferred relationship | Some | 2 | 
| Craniosynostosis Boston type (disorder) | Associated morphology | True | Premature fusion | Inferred relationship | Some | 3 | 
| Craniosynostosis Philadelphia type (disorder) | Associated morphology | True | Premature fusion | Inferred relationship | Some | 3 | 
| Curry Jones syndrome | Associated morphology | True | Premature fusion | Inferred relationship | Some | 4 | 
| Hunter McAlpine craniosynostosis syndrome (disorder) | Associated morphology | True | Premature fusion | Inferred relationship | Some | 1 | 
| Lowry MacLean syndrome (disorder) | Associated morphology | True | Premature fusion | Inferred relationship | Some | 2 | 
| Obesity, colitis, hypothyroidism, cardiac hypertrophy, developmental delay syndrome (disorder) | Associated morphology | True | Premature fusion | Inferred relationship | Some | 2 | 
| Agammaglobulinemia, microcephaly, craniosynostosis, severe dermatitis syndrome (disorder) | Associated morphology | True | Premature fusion | Inferred relationship | Some | 3 | 
| Familial scaphocephaly syndrome McGillivray type (disorder) | Associated morphology | True | Premature fusion | Inferred relationship | Some | 1 | 
| Craniomicromelic syndrome (disorder) | Associated morphology | True | Premature fusion | Inferred relationship | Some | 1 | 
| Craniosynostosis fibular aplasia syndrome (disorder) | Associated morphology | True | Premature fusion | Inferred relationship | Some | 1 | 
| Trigonocephaly, short stature, developmental delay syndrome (disorder) | Associated morphology | True | Premature fusion | Inferred relationship | Some | 1 | 
| Trigonocephaly C syndrome (disorder) | Associated morphology | True | Premature fusion | Inferred relationship | Some | 1 | 
| Holoprosencephaly craniosynostosis syndrome (disorder) | Associated morphology | True | Premature fusion | Inferred relationship | Some | 1 | 
| Pseudoaminopterin syndrome (disorder) | Associated morphology | True | Premature fusion | Inferred relationship | Some | 3 | 
| Acrocephalopolysyndactyly type IV | Associated morphology | False | Premature fusion | Inferred relationship | Some | 2 | 
| Summitt syndrome | Associated morphology | False | Premature fusion | Inferred relationship | Some | 1 | 
| SCARF syndrome | Associated morphology | True | Premature fusion | Inferred relationship | Some | 4 | 
| Premature restriction of foramen ovale (disorder) | Associated morphology | True | Premature fusion | Inferred relationship | Some | 1 | 
| Closed ductus venosus | Associated morphology | True | Premature fusion | Inferred relationship | Some | 1 | 
| Acrobrachycephaly | Associated morphology | True | Premature fusion | Inferred relationship | Some | 1 | 
| Fronto-malar faciosynostosis | Associated morphology | True | Premature fusion | Inferred relationship | Some | 1 | 
| Parieto-occipital craniosynostosis | Associated morphology | True | Premature fusion | Inferred relationship | Some | 1 | 
| Interparietal craniosynostosis (disorder) | Associated morphology | True | Premature fusion | Inferred relationship | Some | 1 | 
| Solitary median maxillary central incisor syndrome | Associated morphology | True | Premature fusion | Inferred relationship | Some | 3 | 
| Fibroblast growth factor receptor 2-related bent bone dysplasia (disorder) | Associated morphology | True | Premature fusion | Inferred relationship | Some | 2 | 
| Cloverleaf skull, asphyxiating thoracic dysplasia syndrome (disorder) | Associated morphology | True | Premature fusion | Inferred relationship | Some | 2 | 
| Cloverleaf skull, asphyxiating thoracic dysplasia syndrome (disorder) | Associated morphology | True | Premature fusion | Inferred relationship | Some | 3 | 
| Cloverleaf skull, asphyxiating thoracic dysplasia syndrome (disorder) | Associated morphology | True | Premature fusion | Inferred relationship | Some | 4 | 
| Craniorhiny (disorder) | Associated morphology | True | Premature fusion | Inferred relationship | Some | 3 | 
| Muenke syndrome | Associated morphology | True | Premature fusion | Inferred relationship | Some | 1 | 
| Craniosynostosis syndrome | Associated morphology | True | Premature fusion | Inferred relationship | Some | 1 | 
| Antley-Bixler syndrome | Associated morphology | True | Premature fusion | Inferred relationship | Some | 1 | 
| Antley-Bixler syndrome | Associated morphology | True | Premature fusion | Inferred relationship | Some | 3 | 
| Jackson-Weiss syndrome | Associated morphology | True | Premature fusion | Inferred relationship | Some | 2 | 
| Spheno-fronto-parietal craniofaciosynostosis | Associated morphology | True | Premature fusion | Inferred relationship | Some | 1 | 
| Spheno-fronto-parietal craniofaciosynostosis | Associated morphology | True | Premature fusion | Inferred relationship | Some | 2 | 
| Acrocephalosyndactyly | Associated morphology | True | Premature fusion | Inferred relationship | Some | 2 | 
| Cloverleaf skull syndrome | Associated morphology | True | Premature fusion | Inferred relationship | Some | 1 | 
| Cloverleaf skull syndrome | Associated morphology | True | Premature fusion | Inferred relationship | Some | 2 | 
| Cloverleaf skull syndrome | Associated morphology | True | Premature fusion | Inferred relationship | Some | 3 | 
| Acrocephaly | Associated morphology | True | Premature fusion | Inferred relationship | Some | 1 | 
| Acrocephaly | Associated morphology | True | Premature fusion | Inferred relationship | Some | 2 | 
| Pfeiffer syndrome type 1 (disorder) | Associated morphology | True | Premature fusion | Inferred relationship | Some | 2 | 
| Pfeiffer syndrome type 2 (disorder) | Associated morphology | True | Premature fusion | Inferred relationship | Some | 2 | 
| Pfeiffer syndrome type 3 (disorder) | Associated morphology | True | Premature fusion | Inferred relationship | Some | 2 | 
| Metopic ridging, ptosis, facial dysmorphism syndrome | Associated morphology | True | Premature fusion | Inferred relationship | Some | 2 | 
| Non-syndromic metopic craniosynostosis (disorder) | Associated morphology | True | Premature fusion | Inferred relationship | Some | 2 | 
| Craniosynostosis, microretrognathia, severe intellectual disability syndrome | Associated morphology | True | Premature fusion | Inferred relationship | Some | 1 |