| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group | 
| Dandy-Walker syndrome | Is a | True | Congenital hydrocephalus | Inferred relationship | Some |  | 
| Arnold-Chiari syndrome | Is a | False | Congenital hydrocephalus | Inferred relationship | Some |  | 
| Congenital stenosis of aqueduct of Sylvius | Is a | False | Congenital hydrocephalus | Inferred relationship | Some |  | 
| Spina bifida with hydrocephalus | Is a | True | Congenital hydrocephalus | Inferred relationship | Some |  | 
| Foramen of Magendie atresia (disorder) | Is a | False | Congenital hydrocephalus | Inferred relationship | Some |  | 
| Foramen of Luschka atresia (disorder) | Is a | False | Congenital hydrocephalus | Inferred relationship | Some |  | 
| Congenital hydrocephalus due to toxoplasmosis | Is a | False | Congenital hydrocephalus | Inferred relationship | Some |  | 
| Other specified congenital hydrocephalus | Is a | False | Congenital hydrocephalus | Inferred relationship | Some |  | 
| Congenital hydrocephalus NOS | Is a | False | Congenital hydrocephalus | Inferred relationship | Some |  | 
| [X]Other congenital hydrocephalus | Is a | False | Congenital hydrocephalus | Inferred relationship | Some |  | 
| Myelocele with hydrocephalus | Is a | False | Congenital hydrocephalus | Inferred relationship | Some |  | 
| Spina bifida with hydrocephalus of late onset | Is a | False | Congenital hydrocephalus | Inferred relationship | Some |  | 
| Rachischisis with hydrocephalus | Is a | False | Congenital hydrocephalus | Inferred relationship | Some |  | 
| Hydromyelocele with hydrocephalus | Is a | False | Congenital hydrocephalus | Inferred relationship | Some |  | 
| Fetal hydrocephalus suspected (situation) | Associated finding | False | Congenital hydrocephalus | Inferred relationship | Some | 1 | 
| Cerebral degeneration due to congenital hydrocephalus | Due to | True | Congenital hydrocephalus | Inferred relationship | Some | 2 | 
| Fetal hydrocephalus suspected (situation) | Associated finding | False | Congenital hydrocephalus | Inferred relationship | Some | 1 | 
| Family history of congenital hydrocephalus | Associated finding | True | Congenital hydrocephalus | Inferred relationship | Some | 1 | 
| Cerebellum agenesis with hydrocephaly | Is a | True | Congenital hydrocephalus | Inferred relationship | Some |  | 
| Growth delay with hydrocephalus and lung hypoplasia syndrome (disorder) | Is a | True | Congenital hydrocephalus | Inferred relationship | Some |  | 
| Vertebral abnormality, anal atresia, cardiac abnormality, tracheo-esophageal fistula, renal anomaly, limb defect syndrome with hydrocephalus (disorder) | Is a | True | Congenital hydrocephalus | Inferred relationship | Some |  | 
| Capra DeMarco syndrome (disorder) | Is a | True | Congenital hydrocephalus | Inferred relationship | Some |  | 
| Hydrocephalus with endocardial fibroelastosis and cataract syndrome (disorder) | Is a | True | Congenital hydrocephalus | Inferred relationship | Some |  | 
| Hydrocephalus, cardiac malformation, dense bone syndrome (disorder) | Is a | True | Congenital hydrocephalus | Inferred relationship | Some |  | 
| Hydrocephalus, costovertebral dysplasia, Sprengel anomaly syndrome (disorder) | Is a | True | Congenital hydrocephalus | Inferred relationship | Some |  | 
| Hydrocephalus with obesity and hypogonadism syndrome (disorder) | Is a | True | Congenital hydrocephalus | Inferred relationship | Some |  | 
| Megalencephaly, polymicrogyria, postaxial polydactyly, hydrocephalus syndrome (disorder) | Is a | True | Congenital hydrocephalus | Inferred relationship | Some |  | 
| Hydrocephalus, tall stature, joint laxity syndrome (disorder) | Is a | True | Congenital hydrocephalus | Inferred relationship | Some |  | 
| Congenital obstructive hydrocephalus | Is a | True | Congenital hydrocephalus | Inferred relationship | Some |  | 
| Hydrocephalus, blue sclera, nephropathy syndrome | Is a | True | Congenital hydrocephalus | Inferred relationship | Some |  | 
| L1 syndrome | Is a | True | Congenital hydrocephalus | Inferred relationship | Some |  | 
| Hydrocephalus associated with congenital aqueduct stenosis (disorder) | Is a | True | Congenital hydrocephalus | Inferred relationship | Some |  | 
| Communicating hydrocephalus co-occurrent and due to congenital agenesis of arachnoid villi (disorder) | Is a | True | Congenital hydrocephalus | Inferred relationship | Some |  | 
| Thoracic dysplasia and hydrocephalus syndrome | Is a | True | Congenital hydrocephalus | Inferred relationship | Some |  | 
| Fetal hydrocephalus (disorder) | Is a | False | Congenital hydrocephalus | Inferred relationship | Some |  | 
| Port-wine nevi, mega cisterna magna, hydrocephalus syndrome | Is a | True | Congenital hydrocephalus | Inferred relationship | Some |  | 
| Congenital hydrocephalus, low insertion of umbilicus syndrome | Is a | True | Congenital hydrocephalus | Inferred relationship | Some |  |