| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group | 
| Hydranencephaly | Associated morphology | False | Aplasia | Inferred relationship | Existential restriction modifier | 2 | 
| Pulmonary valve agenesis, tetralogy of Fallot, absence of ductus arteriosus syndrome | Associated morphology | True | Aplasia | Inferred relationship | Existential restriction modifier | 3 | 
| Aniridia, renal agenesis, psychomotor retardation syndrome | Associated morphology | True | Aplasia | Inferred relationship | Existential restriction modifier | 1 | 
| Partial corpus callosum agenesis, cerebellar vermis hypoplasia with posterior fossa cysts syndrome | Associated morphology | False | Aplasia | Inferred relationship | Existential restriction modifier | 3 | 
| Partial agenesis of corpus callosum | Associated morphology | False | Aplasia | Inferred relationship | Existential restriction modifier | 1 | 
| Hemicephaly | Associated morphology | False | Aplasia | Inferred relationship | Existential restriction modifier | 2 | 
| Curry Jones syndrome | Associated morphology | True | Aplasia | Inferred relationship | Existential restriction modifier | 3 | 
| Hydranencephaly with proliferative vasculopathy | Associated morphology | False | Aplasia | Inferred relationship | Existential restriction modifier | 2 | 
| Congenital absence of part of brain | Associated morphology | False | Aplasia | Inferred relationship | Existential restriction modifier | 1 | 
| Congenital tibial deficiency type II | Associated morphology | True | Aplasia | Inferred relationship | Existential restriction modifier | 1 | 
| Aplasia of uterine cervix | Associated morphology | True | Aplasia | Inferred relationship | Existential restriction modifier | 1 | 
| Aplasia of body of uterus | Associated morphology | True | Aplasia | Inferred relationship | Existential restriction modifier | 1 | 
| Hereditary isolated aplastic anemia | Associated morphology | True | Aplasia | Inferred relationship | Existential restriction modifier | 1 | 
| Absent thumb with short stature and immunodeficiency syndrome | Associated morphology | True | Aplasia | Inferred relationship | Existential restriction modifier | 1 | 
| Mullerian aplasia | Associated morphology | True | Aplasia | Inferred relationship | Existential restriction modifier | 1 | 
| WNT4 Müllerian aplasia and ovarian dysfunction | Associated morphology | True | Aplasia | Inferred relationship | Existential restriction modifier | 2 | 
| Ablepharon of bilateral eyelids | Associated morphology | False | Aplasia | Inferred relationship | Existential restriction modifier | 1 | 
| Ablepharon of bilateral eyelids | Associated morphology | False | Aplasia | Inferred relationship | Existential restriction modifier | 2 | 
| Congenital absence of seminal vesicle | Associated morphology | True | Aplasia | Inferred relationship | Existential restriction modifier | 1 | 
| Transverse deficiency | Is a | True | Aplasia | Inferred relationship | Existential restriction modifier |  | 
| Autosomal dominant Robinow syndrome | Associated morphology | True | Aplasia | Inferred relationship | Existential restriction modifier | 4 | 
| Autosomal recessive Robinow syndrome | Associated morphology | True | Aplasia | Inferred relationship | Existential restriction modifier | 4 | 
| B cell lymphocyte aplasia caused by drug | Associated morphology | True | Aplasia | Inferred relationship | Existential restriction modifier | 1 | 
| Congenital absence of skin on scalp with epidermal nevi | Associated morphology | True | Aplasia | Inferred relationship | Existential restriction modifier | 2 | 
| Totally absent pericardium | Associated morphology | True | Aplasia | Inferred relationship | Existential restriction modifier | 1 | 
| Congenital absence of germinal epithelium of testes | Associated morphology | True | Aplasia | Inferred relationship | Existential restriction modifier | 1 | 
| Aplasia cutis congenita | Associated morphology | True | Aplasia | Inferred relationship | Existential restriction modifier | 1 | 
| Adams-Oliver syndrome | Associated morphology | True | Aplasia | Inferred relationship | Existential restriction modifier | 1 | 
| Congenital absence of skin on scalp | Associated morphology | True | Aplasia | Inferred relationship | Existential restriction modifier | 2 | 
| Aplasia cutis congenita due to underlying malformation (Type 4) | Associated morphology | True | Aplasia | Inferred relationship | Existential restriction modifier | 1 | 
| Aplasia cutis congenita associated with fetus papyraceus (Type 5) | Associated morphology | True | Aplasia | Inferred relationship | Existential restriction modifier | 1 | 
| Aplasia cutis congenita in association with epidermolysis bullosa (Type 6) | Associated morphology | True | Aplasia | Inferred relationship | Existential restriction modifier | 1 | 
| Aplasia cutis congenita due to teratogenic drug (Type 7) | Associated morphology | True | Aplasia | Inferred relationship | Existential restriction modifier | 1 | 
| Aplasia cutis congenita following intra-uterine infection (Type 8) | Associated morphology | True | Aplasia | Inferred relationship | Existential restriction modifier | 1 | 
| Aplasia cutis congenita secondary to malformation syndrome (Type 9) | Associated morphology | True | Aplasia | Inferred relationship | Existential restriction modifier | 1 | 
| Oculocerebrocutaneous syndrome | Associated morphology | True | Aplasia | Inferred relationship | Existential restriction modifier | 1 | 
| Aplasia cutis in Trisomy 13 syndrome | Associated morphology | True | Aplasia | Inferred relationship | Existential restriction modifier | 1 | 
| Aplasia cutis in Chromosome 4 short-arm deletion syndrome (Wolf-Hirschhorn) | Associated morphology | True | Aplasia | Inferred relationship | Existential restriction modifier | 1 | 
| Aplasia cutis in Johanson-Blizzard syndrome | Associated morphology | True | Aplasia | Inferred relationship | Existential restriction modifier | 1 | 
| Aplasia cutis with myopia syndrome | Associated morphology | True | Aplasia | Inferred relationship | Existential restriction modifier | 1 | 
| Aplasia cutis congenita with intestinal lymphangiectasia syndrome | Associated morphology | True | Aplasia | Inferred relationship | Existential restriction modifier | 2 | 
| Aplasia cutis congenita with epibulbar dermoid syndrome | Associated morphology | True | Aplasia | Inferred relationship | Existential restriction modifier | 2 | 
| Sebaceous nevus, central nervous system malformations, aplasia cutis congenita, limbal dermoid, pigmented nevus syndrome | Associated morphology | True | Aplasia | Inferred relationship | Existential restriction modifier | 2 | 
| Didymosis aplasticosebacea | Associated morphology | True | Aplasia | Inferred relationship | Existential restriction modifier | 1 | 
| Aplasia cutis congenita of limb | Associated morphology | True | Aplasia | Inferred relationship | Existential restriction modifier | 2 | 
| Autosomal recessive aplasia cutis congenita of limb | Associated morphology | True | Aplasia | Inferred relationship | Existential restriction modifier | 2 | 
| Partial absence of septum pellucidum | Associated morphology | True | Aplasia | Inferred relationship | Existential restriction modifier | 1 | 
| Congenital partial absence of gastric muscle | Associated morphology | True | Aplasia | Inferred relationship | Existential restriction modifier | 1 | 
| Transient acquired pure red cell aplasia | Associated morphology | True | Aplasia | Inferred relationship | Existential restriction modifier | 4 | 
| [X]Other specified aplastic anaemias | Associated morphology | False | Aplasia | Inferred relationship | Existential restriction modifier | 1 | 
| [X]Other acquired pure red cell aplasias | Associated morphology | False | Aplasia | Inferred relationship | Existential restriction modifier | 1 | 
| [X]Acquired pure red cell aplasia, unspecified | Associated morphology | False | Aplasia | Inferred relationship | Existential restriction modifier | 1 | 
| Aplastic anemia NOS (disorder) | Associated morphology | False | Aplasia | Inferred relationship | Existential restriction modifier | 1 | 
| Constitutional aplastic anemia without mention of malformation (disorder) | Associated morphology | False | Aplasia | Inferred relationship | Existential restriction modifier | 1 | 
| Acquired aplastic anemia NOS (disorder) | Associated morphology | False | Aplasia | Inferred relationship | Existential restriction modifier | 1 | 
| Other specified constitutional aplastic anemia (disorder) | Associated morphology | False | Aplasia | Inferred relationship | Existential restriction modifier | 1 | 
| Secondary red cell aplasia NEC | Associated morphology | False | Aplasia | Inferred relationship | Existential restriction modifier | 1 | 
| Constitutional aplastic anemia NOS (disorder) | Associated morphology | False | Aplasia | Inferred relationship | Existential restriction modifier | 1 | 
| Erythropoiesis stimulating agent induced antibody mediated acquired pure red cell aplasia | Associated morphology | False | Aplasia | Inferred relationship | Existential restriction modifier | 1 |