olivopontocerebellar atrophy

noun

ol·​i·​vo·​pon·​to·​cer·​e·​bel·​lar atrophy -ˌpän-tō-ˌser-ə-ˈbel-ər- 

: an inherited disease especially of mid to late life that is characterized by ataxia, hypotonia, dysarthria, and degeneration of the cerebellar cortex, middle cerebellar peduncles, and inferior olives

called also olivopontocerebellar degeneration