| Phenotype details |
developmental delay; short stature 3 SDs below mean, proportionate; dolichocephaly, prominent forehead and occiput, deep-set eyes; left cryptorchidism, pectus excavatum, tapering fingers, pes planus, shortened great toes; gait ataxia; truncal ataxia; hypotonia; dysarthria; no tremor (postural, intention); no seizures, EEG normal; microcephaly (75th–91st percentile); high-pitched voice; no nystagmus; no saccadic abnormalities; no jerky eye movements; strabismus (esotropia); 2y-stand; 5y8m-walk; 6 years, 6 months; speech 50 words, just putting two words together; special school, intellectual disability (IQ71); no problems reported; MRI brain described as cerebellar cleft or absent vermis, cerebellar atrophy suggested from comparison of scans at ages 1 and 5 years, atrophy of pontine tegmentum |