| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group | 
| Pachydermoperiostosis of nail | Is a | True | Congenital anomaly of nail | Inferred relationship | Existential restriction modifier |  | 
| Bifid nail | Is a | True | Congenital anomaly of nail | Inferred relationship | Existential restriction modifier |  | 
| Congenital enlarged nails | Is a | True | Congenital anomaly of nail | Inferred relationship | Existential restriction modifier |  | 
| Congenital koilonychia | Is a | True | Congenital anomaly of nail | Inferred relationship | Existential restriction modifier |  | 
| Anonychia | Is a | True | Congenital anomaly of nail | Inferred relationship | Existential restriction modifier |  | 
| Robinson nail dystrophy-deafness syndrome | Is a | False | Congenital anomaly of nail | Inferred relationship | Existential restriction modifier |  | 
| Subungual fibroma | Is a | False | Congenital anomaly of nail | Inferred relationship | Existential restriction modifier |  | 
| Congenital leukonychia | Is a | True | Congenital anomaly of nail | Inferred relationship | Existential restriction modifier |  | 
| Congenital clubnail | Is a | True | Congenital anomaly of nail | Inferred relationship | Existential restriction modifier |  | 
| Pili torti-deafness syndrome | Is a | False | Congenital anomaly of nail | Inferred relationship | Existential restriction modifier |  | 
| Congenital onychauxis | Is a | False | Congenital anomaly of nail | Inferred relationship | Existential restriction modifier |  | 
| Congenital anomaly of claw | Is a | False | Congenital anomaly of nail | Inferred relationship | Existential restriction modifier |  | 
| Specified nail anomalies NOS | Is a | False | Congenital anomaly of nail | Inferred relationship | Existential restriction modifier |  | 
| [X]Other congenital malformations of nails | Is a | False | Congenital anomaly of nail | Inferred relationship | Existential restriction modifier |  | 
| Unspecified congenital anomalies of nail | Is a | False | Congenital anomaly of nail | Inferred relationship | Existential restriction modifier |  | 
| Pachyonychia congenita syndrome | Is a | True | Congenital anomaly of nail | Inferred relationship | Existential restriction modifier |  | 
| Acrocephalosyndactyly type V | Is a | False | Congenital anomaly of nail | Inferred relationship | Existential restriction modifier |  | 
| Oto-onycho-peroneal syndrome | Is a | True | Congenital anomaly of nail | Inferred relationship | Existential restriction modifier |  | 
| Congenital onychauxis | Is a | False | Congenital anomaly of nail | Inferred relationship | Existential restriction modifier |  | 
| Congenital onychodysplasia of index fingers | Is a | True | Congenital anomaly of nail | Inferred relationship | Existential restriction modifier |  | 
| Ectodermal dysplasia with hair-nail defect | Is a | False | Congenital anomaly of nail | Inferred relationship | Existential restriction modifier |  | 
| Mammary digital nail syndrome | Is a | True | Congenital anomaly of nail | Inferred relationship | Existential restriction modifier |  | 
| Brachymorphism with onychodysplasia and dysphalangism syndrome | Is a | True | Congenital anomaly of nail | Inferred relationship | Existential restriction modifier |  | 
| Cooks syndrome | Is a | True | Congenital anomaly of nail | Inferred relationship | Existential restriction modifier |  | 
| Deafness, enamel hypoplasia, nail defect syndrome | Is a | False | Congenital anomaly of nail | Inferred relationship | Existential restriction modifier |  | 
| Hirschsprung disease with nail hypoplasia and dysmorphism | Is a | True | Congenital anomaly of nail | Inferred relationship | Existential restriction modifier |  | 
| Severe T-cell immunodeficiency, congenital alopecia, nail dystrophy syndrome | Is a | True | Congenital anomaly of nail | Inferred relationship | Existential restriction modifier |  | 
| Dystrophic epidermolysis bullosa nails only | Is a | True | Congenital anomaly of nail | Inferred relationship | Existential restriction modifier |  | 
| Temple Baraitser syndrome | Is a | True | Congenital anomaly of nail | Inferred relationship | Existential restriction modifier |  | 
| Pectus excavatum, macrocephaly, dysplastic nails syndrome | Is a | True | Congenital anomaly of nail | Inferred relationship | Existential restriction modifier |  | 
| Nail and tooth abnormalities, marginal palmoplantar keratoderma, oral hyperpigmentation syndrome | Is a | False | Congenital anomaly of nail | Inferred relationship | Existential restriction modifier |  | 
| Trichoodontoonychial dysplasia | Is a | False | Congenital anomaly of nail | Inferred relationship | Existential restriction modifier |  | 
| Congenital onychoatrophy | Is a | True | Congenital anomaly of nail | Inferred relationship | Existential restriction modifier |  | 
| Short stature, onychodysplasia, facial dysmorphism, hypotrichosis syndrome | Is a | True | Congenital anomaly of nail | Inferred relationship | Existential restriction modifier |  | 
| Deafness with onychodystrophy syndrome | Is a | False | Congenital anomaly of nail | Inferred relationship | Existential restriction modifier |  | 
| Nail-patella syndrome | Is a | True | Congenital anomaly of nail | Inferred relationship | Existential restriction modifier |  | 
| Ectodermal dysplasia with nail defect | Is a | True | Congenital anomaly of nail | Inferred relationship | Existential restriction modifier |  | 
| Congenital malalignment of great toenail | Is a | True | Congenital anomaly of nail | Inferred relationship | Existential restriction modifier |  | 
| Congenital malalignment of multiple toenails | Is a | True | Congenital anomaly of nail | Inferred relationship | Existential restriction modifier |  | 
| Congenital pterygium of nail | Is a | True | Congenital anomaly of nail | Inferred relationship | Existential restriction modifier |  | 
| Split-foot malformation, mesoaxial polydactyly syndrome | Is a | True | Congenital anomaly of nail | Inferred relationship | Existential restriction modifier |  | 
| Congenital isolated onychodysplasia | Is a | True | Congenital anomaly of nail | Inferred relationship | Existential restriction modifier |  | 
| [X]Other congenital malformations of nails | Is a | False | Congenital anomaly of nail | Inferred relationship | Existential restriction modifier |  | 
| Specified nail anomalies NOS | Is a | False | Congenital anomaly of nail | Inferred relationship | Existential restriction modifier |  | 
| Unspecified congenital anomalies of nail | Is a | False | Congenital anomaly of nail | Inferred relationship | Existential restriction modifier |  |