AFP and cerebellar ataxia: Ataxia with oculomotor apraxia type 2 (AOA2) is characterized by onset of ataxia between age 10 and 25 years, sensorimotor neuropathy, postural tremor, dystonia, strabismus, oculomotor apraxia, cerebellar atrophy and elevated serum level of alpha-fetoprotein (AFP) [39].