| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group | 
| Congenital microcephaly | Is a | True | Microcephaly | Inferred relationship | Existential restriction modifier |  | 
| Family history of microcephaly | Associated finding | True | Microcephaly | Inferred relationship | Existential restriction modifier | 1 | 
| Secondary microcephaly | Is a | True | Microcephaly | Inferred relationship | Existential restriction modifier |  | 
| Fetal microcephaly | Is a | True | Microcephaly | Inferred relationship | Existential restriction modifier |  | 
| Deficiency of leukotriene C4 synthase | Is a | True | Microcephaly | Inferred relationship | Existential restriction modifier |  | 
| Infantile cerebral and cerebellar atrophy with postnatal progressive microcephaly | Is a | True | Microcephaly | Inferred relationship | Existential restriction modifier |  | 
| Microcephaly, short stature, intellectual disability, facial dysmorphism syndrome | Is a | True | Microcephaly | Inferred relationship | Existential restriction modifier |  | 
| Microcephaly, thin corpus callosum, intellectual disability syndrome | Is a | True | Microcephaly | Inferred relationship | Existential restriction modifier |  | 
| Severe neonatal onset encephalopathy with microcephaly | Is a | True | Microcephaly | Inferred relationship | Existential restriction modifier |  | 
| Child head circumference < 0.4th centile | Is a | True | Microcephaly | Inferred relationship | Existential restriction modifier |  | 
| Child head circumference = 0.4th centile | Is a | True | Microcephaly | Inferred relationship | Existential restriction modifier |  | 
| Child head circumference 0.5th - 1.9th centile | Is a | True | Microcephaly | Inferred relationship | Existential restriction modifier |  | 
| Child head circumference equal to 2nd centile | Is a | True | Microcephaly | Inferred relationship | Existential restriction modifier |  | 
| Early-onset progressive encephalopathy, hearing loss, pons hypoplasia, brain atrophy syndrome | Is a | True | Microcephaly | Inferred relationship | Existential restriction modifier |  | 
| Microcephaly, congenital cataract, psoriasiform dermatitis syndrome | Is a | True | Microcephaly | Inferred relationship | Existential restriction modifier |  | 
| Severe intellectual disability, progressive postnatal microcephaly, midline stereotypic hand movements syndrome | Is a | True | Microcephaly | Inferred relationship | Existential restriction modifier |  | 
| Progressive microcephaly, seizures, cortical blindness, developmental delay syndrome | Is a | True | Microcephaly | Inferred relationship | Existential restriction modifier |  | 
| X-linked intellectual developmental disorder Christianson type | Is a | True | Microcephaly | Inferred relationship | Existential restriction modifier |  | 
| Postnatal microcephaly, infantile hypotonia, spastic diplegia, dysarthria, intellectual disability syndrome | Is a | True | Microcephaly | Inferred relationship | Existential restriction modifier |  | 
| Intrauterine growth restriction, congenital multiple café au lait macules, increased sister chromatid exchange syndrome | Is a | True | Microcephaly | Inferred relationship | Existential restriction modifier |  | 
| Severe neurodevelopmental disorder with feeding difficulties, stereotypic hand movement, bilateral cataract | Is a | True | Microcephaly | Inferred relationship | Existential restriction modifier |  | 
| Congenital ichthyosis, microcephalus, tetraplegia syndrome | Is a | True | Microcephaly | Inferred relationship | Existential restriction modifier |  | 
| Sanjad Sakati syndrome | Is a | True | Microcephaly | Inferred relationship | Existential restriction modifier |  | 
| Progressive cerebello-cerebral atrophy | Is a | True | Microcephaly | Inferred relationship | Existential restriction modifier |  | 
| Inosine triphosphate pyrophosphohydrolase-related lethal infantile neurological disorder with cataract and cardiac involvement | Is a | True | Microcephaly | Inferred relationship | Existential restriction modifier |  | 
| Phospholipase A2 activating protein-associated neurodevelopmental disorder | Is a | True | Microcephaly | Inferred relationship | Existential restriction modifier |  | 
| Spastic tetraplegia, thin corpus callosum, progressive postnatal microcephaly syndrome | Is a | True | Microcephaly | Inferred relationship | Existential restriction modifier |  | 
| Pyrroline-5-carboxylate reductase 2 related microcephaly, progressive leukoencephalopathy | Is a | True | Microcephaly | Inferred relationship | Existential restriction modifier |  | 
| Fatty acyl-coenzyme A reductase 1 deficiency | Is a | True | Microcephaly | Inferred relationship | Existential restriction modifier |  | 
| Ubiquitin specific peptidase 18 deficiency | Is a | True | Microcephaly | Inferred relationship | Existential restriction modifier |  | 
| Menke Hennekam syndrome | Is a | True | Microcephaly | Inferred relationship | Existential restriction modifier |  |