A rare genetic developmental defect during embryogenesis syndrome with characteristics of severe intellectual disability, distinct dysmorphic facial features (including triangular face with prominent forehead, narrow palpebral fissures, deep-set eyes, low-set ears, broad nose, malar hypoplasia, short philtrum, macrostomia, widely spaced teeth) and pre and postnatal proportionate short stature, ranging from primordial dwarfism to a milder phenotype with less severe growth restriction. Other reported features include skeletal findings (for example scoliosis), microcephaly, involuntary hand movements, hypersensitivity to stimuli and anxiety. There is evidence this disease is caused by homozygous or compound heterozygous mutation in the LARP7 gene on chromosome 4q25.