Early onset cerebellar ataxia with retained reflexes (EOCARR) or Harding ataxia is a cerebellar ataxia characterized by the progressive association of a cerebellar and pyramidal syndrome with progressive cerebellar ataxia, brisk tendon reflexes, and sometimes profound sensory loss. The disease is early-onset cerebellar ataxia with retained tendon reflexes (MONDO_0008938). Also known as: EOCA, EOCARR, Harding ataxia.