| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group | 
| Sacral spina bifida with hydrocephalus - closed | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 3 | 
| Fissured spine with hydrocephalus | Associated morphology | False | Dilatation | Inferred relationship | Existential restriction modifier | 4 | 
| Lumbar spina bifida with hydrocephalus - open | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 3 | 
| Lumbar spina bifida with hydrocephalus | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 4 | 
| Acquired dilation of bile duct | Associated morphology | False | Dilatation | Inferred relationship | Existential restriction modifier | 2 | 
| Hydrocephalus with endocardial fibroelastosis and cataract syndrome | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Hirschsprung disease with nail hypoplasia and dysmorphism | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 4 | 
| Acquired hydrocephalus of newborn | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Hydrocephalus, cardiac malformation, dense bone syndrome | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 3 | 
| Congenital dilation of right pulmonary artery | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Congenital dilatation of cardiac ventricle | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Waardenburg Shah syndrome | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Congenital dilation of left pulmonary artery | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Congenital dilatation of pulmonary artery | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Hypoplasia of corpus callosum, intellectual disability, adducted thumbs, spasticity, hydrocephalus syndrome | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Congenital dilatation of ductus arteriosus | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Secondary congenital megacolon | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Hydrocephalus, tall stature, joint laxity syndrome | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 2 | 
| Congenital dilatation of atrium | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Growth delay with hydrocephalus and lung hypoplasia syndrome | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Extensive aganglionosis Hirschsprung disease | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 2 | 
| Congenital cystic bronchiectasis | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Total intestinal aganglionosis | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Congenital dilation of ascending aorta | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Capra DeMarco syndrome | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 2 | 
| Congenital primary megaureter | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Giant esophagus | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 2 | 
| Short segment Hirschsprung's disease | Associated morphology | False | Dilatation | Inferred relationship | Existential restriction modifier | 2 | 
| Congenital enlargement of coronary sinus | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Congenital dilatation of trachea | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Haddad syndrome | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Vertebral abnormality, anal atresia, cardiac abnormality, tracheo-esophageal fistula, renal anomaly, limb defect syndrome with hydrocephalus | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Congenital dilatation of aorta | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Congenital dilation of bile duct | Associated morphology | False | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Caroli disease | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Congenital dilatation of lobar intrahepatic bile duct | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Mowat-Wilson syndrome | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Agenesis of cerebellum and hydrocephalus syndrome | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Congenital dilatation of stomach | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Hydrocephalus, costovertebral dysplasia, Sprengel anomaly syndrome | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 2 | 
| Congenital dilatation of inferior vena cava | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Hirschsprung disease with deafness and polydactyly syndrome | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 3 | 
| Congenital dilatation of innominate artery | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Congenital dilatation of bladder | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Congenital dilatation of colon | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Hydrocephalus, blue sclera, nephropathy syndrome | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 2 | 
| Bilateral congenital primary hydronephrosis | Associated morphology | False | Dilatation | Inferred relationship | Existential restriction modifier | 2 | 
| Aganglionosis of Auerbach's plexus | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 2 | 
| Congenital bronchiectasis | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Congenital megaduodenum | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Megalencephaly, polymicrogyria, postaxial polydactyly, hydrocephalus syndrome | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Congenital hydrocephalus caused by toxoplasmosis | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Congenital dilatation of renal pelvis | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Congenital obstructive hydrocephalus | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Okamoto syndrome | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Ectasia of left atrial appendage | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Congenital dilatation of subclavian artery | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Hirschsprung disease with type D brachydactyly syndrome | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 2 | 
| Familial idiopathic dilatation of right atrium | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Megacystis-megaureter syndrome | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Hirschsprung's disease | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Congenital hydrocephalus | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Hydrocephalus with obesity and hypogonadism syndrome | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 2 | 
| Congenital macrocolon, not aganglionic | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Ectasia of right atrial appendage | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Congenital dilatation of superior vena cava | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Congenital dilatation of intestinal tract | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Congenital dilatation of carotid artery | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Familial thoracic aortic aneurysm and aortic dissection | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Congenital dilatation of esophagus | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Congenital dilatation of aortic arch | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Congenital dilatation of ureter | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Congenital dilatation of aortic root | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Hirschsprung disease of rectosigmoid region | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Megalourethra | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Goldberg Shprintzen megacolon syndrome | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 4 | 
| Long segment Hirschsprung's disease | Associated morphology | False | Dilatation | Inferred relationship | Existential restriction modifier | 2 | 
| Fetal hydrocephalus | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Hirschsprung disease, ganglioneuroblastoma syndrome | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Myelocele with hydrocephalus | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 4 | 
| Corneal ectasia | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Pellucid marginal degeneration of cornea of bilateral eyes | Associated morphology | False | Dilatation | Inferred relationship | Existential restriction modifier | 3 | 
| Pellucid marginal degeneration of cornea of left eye | Associated morphology | False | Dilatation | Inferred relationship | Existential restriction modifier | 2 | 
| Pellucid marginal degeneration of cornea of right eye | Associated morphology | False | Dilatation | Inferred relationship | Existential restriction modifier | 2 | 
| Corneal ectasia of bilateral eyes | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Corneal ectasia of bilateral eyes | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 2 | 
| Corneal ectasia of right eye | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Acquired keratoglobus | Associated morphology | False | Dilatation | Inferred relationship | Existential restriction modifier | 2 | 
| Pellucid marginal corneal degeneration | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 2 | 
| Corneal ectasia of left eye | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Descemetocele | Associated morphology | False | Dilatation | Inferred relationship | Existential restriction modifier | 2 | 
| Thoracic dysplasia and hydrocephalus syndrome | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Corneal ectasia due to and following laser in situ keratomileusis | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 2 | 
| Hydrocalycosis | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Hydromyelocele with hydrocephalus | Associated morphology | False | Dilatation | Inferred relationship | Existential restriction modifier | 4 | 
| Congenital keratoglobus | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 3 | 
| Port-wine nevi, mega cisterna magna, hydrocephalus syndrome | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Acquired dilation of bile duct | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Mammary duct ectasia of right breast | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Mammary duct ectasia of left breast | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 | 
| Acquired keratoglobus | Associated morphology | True | Dilatation | Inferred relationship | Existential restriction modifier | 1 |