A rare genetic syndromic intellectual disability characterized by infantile onset of global developmental delay and profound intellectual disability in association with a heterogeneous spectrum of manifestations, such as features of lower motor neuron disease, hypotonia, spasticity, contractures, seizures, respiratory insufficiency, and optic atrophy, among others. Dysmorphic craniofacial features include microcephaly, tall forehead, bitemporal narrowing, flat nasal bridge, low-set ears, and high-arched palate. Brain imaging may show cerebral and cerebellar atrophy, delayed myelination, and thin corpus callosum.
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microcephaly and chorioretinopathy
MONDO:0000181
microcephaly with or without chorioretinopathy, lymphedema, or intellectual disability
MONDO:0007918
autosomal dominant primary microcephaly
MONDO:0007988
Prader-Willi syndrome
MONDO:0008300
Smith-Magenis syndrome
MONDO:0008434
microcephalic osteodysplastic primordial dwarfism type I
MONDO:0008871