Others Expand There are some other forms of ataxia, such as those below. Ataxia with oculomotor apraxia (AOA) comes in two forms, AOA1 or AOA2. They make two of the rarest types of ataxia. AOA1 AOA2 Dentatorubral pallidoluysian atrophy (DRPLA) is a type of inherited progressive late-onset cerebellar ataxia. It is characterised by a defect in a gene that causes damage to a certain part of the brain, the cerebellum.