| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group | 
| Periungual skin structure (body structure) | Is a | False | Nail unit structure | Inferred relationship | Some |  | 
| Entire nail unit (body structure) | Is a | True | Nail unit structure | Inferred relationship | Some |  | 
| Structure of nail unit of digit of hand (body structure) | Is a | True | Nail unit structure | Inferred relationship | Some |  | 
| Structure of nail matrix (body structure) | Is a | False | Nail unit structure | Inferred relationship | Some |  | 
| Nail bed structure | Is a | False | Nail unit structure | Inferred relationship | Some |  | 
| Structure of nail root | Is a | False | Nail unit structure | Inferred relationship | Some |  | 
| Structure of nail unit of toe | Is a | True | Nail unit structure | Inferred relationship | Some |  | 
| Nail plate structure (body structure) | Is a | False | Nail unit structure | Inferred relationship | Some |  | 
| Nail dystrophy associated with dermatological disease (disorder) | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Trachyonychia | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Congenital onychoatrophy (disorder) | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Open wound of nail | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Nail changes associated with systemic disease (disorder) | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Disorder of nail (disorder) | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Lichen planus of nail | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Drug-induced nail abnormality (disorder) | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Traumatic onycholysis (disorder) | Finding site | False | Nail unit structure | Inferred relationship | Some | 1 | 
| Traumatic onycholysis (disorder) | Finding site | False | Nail unit structure | Inferred relationship | Some | 2 | 
| Yellow nails | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Bitten nails | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Disorder of nail color (disorder) | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Pachyonychia congenita type III of Schafer-Brunauer (disorder) | Finding site | False | Nail unit structure | Inferred relationship | Some | 4 | 
| Physiological brown stripes in nails | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Oto-onycho-peroneal syndrome | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Nail damage caused by chemical agents (disorder) | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| On examination - nails - no abnormality detected | Finding site | False | Nail unit structure | Inferred relationship | Some | 1 | 
| Nail color change due to ingested drug (disorder) | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Onychomycosis (disorder) | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Pitting of nails | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Nail dystrophy due to nail biting (disorder) | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Dystrophia unguium, total | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Melanonychia (disorder) | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Onychomycosis due to Scytalidium hyalinum | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Thickened nails | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Onychomycosis caused by Acremonium (disorder) | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Leukonychia striata (disorder) | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Severe T-cell immunodeficiency, congenital alopecia, nail dystrophy syndrome (disorder) | Finding site | True | Nail unit structure | Inferred relationship | Some | 2 | 
| Nail finding | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Onychomadesis | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Nail damage caused by insecticide (disorder) | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Dystrophia unguium, partial | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Abnormality of nail shape (disorder) | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Wearing of nails | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Onychomycosis caused by Aspergillus | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Hypertrophy of toenail | Finding site | False | Nail unit structure | Inferred relationship | Some | 2 | 
| Onychomycosis due to Epidermophyton floccosum | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| à l'examen : koïlonychie des ongles | Finding site | False | Nail unit structure | Inferred relationship | Some | 1 | 
| Benign neoplasm of nail apparatus (disorder) | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Onychomycosis due to Botryodiplodia theobromae | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Polyonychia (disorder) | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Nails not growing | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Subungual hyperkeratosis | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Nail damage from microwaves (disorder) | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| On examination - nails - pitting | Finding site | False | Nail unit structure | Inferred relationship | Some | 1 | 
| Nail dystrophy due to sarcoidosis (disorder) | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Onychomycosis caused by Neoscytalidium dimidiatum (disorder) | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Onychomycosis due to Curvularia lunata | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Congenital koilonychia | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Excessive growth of nails | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Nail damage from external cause (disorder) | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Onychomycosis due to Fusarium | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Nails grow quickly | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Nail dystrophy due to trauma (disorder) | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Subungual epidermoid inclusions (disorder) | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Thin nails (finding) | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Longitudinal melanonychia | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Shape of nail - finding | Finding site | True | Nail unit structure | Inferred relationship | Some | 2 | 
| Nail dystrophy associated with bullous dermatoses (disorder) | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Separation of nail fold | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Knuckle pads, leukonychia, sensorineural deafness, palmoplantar hyperkeratosis syndrome (disorder) | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Nail damage from external agent (disorder) | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Nail specimen | Specimen source topography | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Nail changes (finding) | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| On examination - nails | Finding site | False | Nail unit structure | Inferred relationship | Some | 3 | 
| Removal of nail (procedure) | Procedure site - Direct (attribute) | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Short stature, onychodysplasia, facial dysmorphism, hypotrichosis syndrome (disorder) | Finding site | True | Nail unit structure | Inferred relationship | Some | 2 | 
| Overcurvature of nail | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Beau's lines secondary to systemic illness (disorder) | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Ectodermal dysplasia with hair-nail defect | Finding site | True | Nail unit structure | Inferred relationship | Some | 2 | 
| Striate leuconychia | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Congenital enlarged nails | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Onychomycosis due to Scopulariopsis brevicaulis | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Congenital pterygium of nail (disorder) | Finding site | True | Nail unit structure | Inferred relationship | Some | 2 | 
| Brachyonychia | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Leukonychia secondary to systemic disease (disorder) | Finding site | True | Nail unit structure | Inferred relationship | Some | 2 | 
| Tricho-oculodermovertebral syndrome | Finding site | True | Nail unit structure | Inferred relationship | Some | 2 | 
| Red half-moon nail in congestive heart failure (disorder) | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Curly hair, ankyloblepharon, nail dysplasia syndrome | Finding site | True | Nail unit structure | Inferred relationship | Some | 2 | 
| Nail bed infection | Finding site | False | Nail unit structure | Inferred relationship | Some | 1 | 
| Onychomycosis due to Onychocola canadensis | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| candidose de la peau et des ongles | Finding site | False | Nail unit structure | Inferred relationship | Some | 1 | 
| Nail tissue finding | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Clubbing of nails associated with systemic disorder (disorder) | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Genetic disorder of nail (disorder) | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| On examination - nails ridged | Finding site | False | Nail unit structure | Inferred relationship | Some | 1 | 
| Superficial white onychomycosis (disorder) | Finding site | False | Nail unit structure | Inferred relationship | Some | 1 | 
| Onychomycosis due to mould infection | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Contusion of toe(s) with damage to nail | Finding site | False | Nail unit structure | Inferred relationship | Some | 2 | 
| Abnormality of nail tissue | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 | 
| Nail dystrophy resulting from poisonous chemical (disorder) | Finding site | True | Nail unit structure | Inferred relationship | Some | 2 | 
| Inherited deformity of nail (disorder) | Finding site | True | Nail unit structure | Inferred relationship | Some | 1 |