| A rare congenital cerebellar malformation disorder with characteristics of complete or partial cerebellar vermis agenesis with no other associated malformations or anomalies. Patients may be asymptomatic although psychomotor delay, hypotonia and incoordination are usually associated. Additional variable manifestations include intellectual disability, oculomotor abnormalities (such as nystagmus, impaired smooth pursuit, impaired saccades, strabismus, ptosis and oculomotor apraxia), retinopathy, abnormal visual evoked potentials, ataxia and delayed gait acquisition, along with delayed speech and language development. |
