| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group | 
| Aortic arch hypoplasia between subclavian and common carotid arteries | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 1 | 
| Pulmonary trunk hypoplasia | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 1 | 
| Hypoplasia of mitral valve annulus | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 1 | 
| Hypoplasia of trabecular portion of left ventricle | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 1 | 
| Hypoplasia of left heart without intrinsic valve stenosis and without atresia | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 1 | 
| Pulmonary venous hypoplasia | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 1 | 
| Hypoplasia of right atrioventricular valve annulus in double inlet ventricle | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 1 | 
| Vascular ring with malrotation and dextroversion of heart and hypoplasia of right lung and left arterial duct | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 2 | 
| Hypoplasia of left atrioventricular valve annulus in double inlet ventricle | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 1 | 
| Hypoplastic tricuspid papillary muscle | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 1 | 
| Aortic arch hypoplasia between carotid arteries | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 1 | 
| Hypoplasia of pulmonary cusps of absent pulmonary valve type | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 2 | 
| Hypoplasia of left ventricular outflow tract | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 1 | 
| Diffuse hypoplasia of left ventricle | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 1 | 
| Aortic arch hypoplasia distal to subclavian artery | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 1 | 
| Turner's tooth | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 1 | 
| Amelogenesis imperfecta - recessive - rough | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 1 | 
| Hereditary splenic hypoplasia | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 3 | 
| Congenital hypoplasia of spleen | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 3 | 
| Congenital hypoplasia of descending aorta | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 2 | 
| Congenital hypoplasia of abdominal aorta | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 2 | 
| Congenital hypoplasia of thoracoabdominal aorta | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 2 | 
| Congenital hypoplasia of brain | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 2 | 
| Amelogenesis imperfecta, hypocalcification type | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 1 | 
| Amelogenesis imperfecta, hypoplastic type with microdontia | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 1 | 
| Amelogenesis imperfecta, pigmented hypomaturation type | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 1 | 
| Amelogenesis imperfecta, hypomaturation type | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 1 | 
| Amelogenesis imperfecta, hypoplastic type | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 1 | 
| Enamel-renal syndrome | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 1 | 
| Kohlschutter's syndrome | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 1 | 
| Congenital horizontal mandibular hypoplasia | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 2 | 
| Congenital vertical mandibular hypoplasia | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 2 | 
| Congenital transverse mandibular hypoplasia | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 2 | 
| Congenital maxillary hypoplasia | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 1 | 
| Hypoplasia of eye | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 3 | 
| Hypoplastic mitral papillary muscle | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 2 | 
| Achondrogenesis, type IA | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 3 | 
| Hypoplasia of uterus and cervix | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 2 | 
| Hypoplasia of uterus and cervix | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 3 | 
| Achondrogenesis, type IB | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 3 | 
| Achondrogenesis | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 3 | 
| Achondrogenesis, type II | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 3 | 
| Achondroplasia | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 5 | 
| Severe achondrolasia with developmental delay and acanthosis nigricans | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 3 | 
| Camptomelic dysplasia | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 5 | 
| Hypoplastic tricuspid papillary muscle | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 2 | 
| Jeune thoracic dystrophy | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 4 | 
| Amelogenesis imperfecta - hypoplastic autosomal dominant - local | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 1 | 
| Amelogenesis imperfecta - hypoplastic autosomal dominant - smooth | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 1 | 
| Amelogenesis imperfecta - hypoplastic autosomal dominant - rough | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 1 | 
| Amelogenesis imperfecta - hypomaturation - recessive pigmented | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 1 | 
| Amelogenesis imperfecta - hypomaturation - snow capped teeth | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 1 | 
| Congenital adrenal hypoplasia, X-linked | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 1 | 
| Rudimentary left ventricle | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 1 | 
| Diffuse hypoplasia of right ventricle | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some |  | 
| Hypoplasia of right ventricular inflow tract | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some |  | 
| Hypoplasia of right ventricular outflow tract | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some |  | 
| Hypoplasia of right ventricular outflow tract and trabecular area | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some |  | 
| Pulmonary valve cusp hypoplasia | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 1 | 
| Pulmonary valve ring hypoplasia | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 1 | 
| Aortic valve ring hypoplasia | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 1 | 
| Hypoplasia of aortic valve cusp | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 1 | 
| Ascending aortic atresia | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 1 | 
| Ascending aorta absent | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 1 | 
| Hypotrichosis with keratosis pilaris and lentiginosis | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 1 | 
| Antley-Bixler syndrome | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 4 | 
| Intrahepatic biliary hypoplasia | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 2 | 
| Craniofacial microsomia | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 3 | 
| Bilateral craniofacial microsomia | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 1 | 
| Hypoplasia of lower limb | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 1 | 
| Undergrowth of whole upper limb | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 3 | 
| Undergrowth of partial upper limb | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 3 | 
| Undergrowth of upper limb | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 3 | 
| Ask-Upmark kidney | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 3 | 
| Congenital hypotrichia | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 3 | 
| Hypotrichosis with keratosis pilaris and lentiginosis | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 3 | 
| Hypoplasia of left ventricular inflow tract | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 3 | 
| Haspeslagh Fryns Muelenaere syndrome | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 3 | 
| Mammary digital nail syndrome | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 6 | 
| Hereditary splenic hypoplasia | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 2 | 
| Acrorenal mandibular syndrome | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 3 | 
| Short stature, pituitary and cerebellar defect and small sella turcica syndrome | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 2 | 
| Scalp, ear, nipple syndrome | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 4 | 
| Congenital hypoganglionosis of large intestine | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 3 | 
| Congenital hypoganglionosis of large intestine | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 4 | 
| Hirschsprung disease with nail hypoplasia and dysmorphism | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 11 | 
| Hypotrichosis with juvenile macular degeneration syndrome | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 7 | 
| Hypotrichosis and intellectual disability syndrome Lopes type | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 4 | 
| Congenital hypoplasia of ascending aorta | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 1 | 
| Non-eruption of teeth, maxillary hypoplasia, genu valgum syndrome | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 5 | 
| Severe intellectual disability, epilepsy, anal anomaly, distal phalangeal hypoplasia syndrome | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 4 | 
| Congenital ichthyosis with hypotrichosis syndrome | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 2 | 
| Neonatal sclerosing cholangitis, ichthyosis, hypotrichosis syndrome | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 3 | 
| Hyposmia, nasal and ocular hypoplasia, hypogonadotropic hypogonadism syndrome | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 5 | 
| Metaphyseal dysplasia, maxillary hypoplasia, brachydactyly syndrome | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 3 | 
| Hyposmia, nasal and ocular hypoplasia, hypogonadotropic hypogonadism syndrome | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 9 | 
| Hereditary hypotrichosis with recurrent skin vesicles syndrome | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 3 | 
| Temple Baraitser syndrome | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 3 | 
| Temple Baraitser syndrome | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 4 | 
| Hemifacial microsomia | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 3 | 
| Oculoauriculovertebral spectrum with radial defects | Associated morphology | False | Congenital hypoplasia | Inferred relationship | Some | 2 |