Cerebellar atrophy Infratentorial atrophy HP:0007203 HP:0002364 Cerebellar atrophy can be diagnosed if the cerebellum is small with shrunken folia and large cerebellar fissures or if it has been shown to undergo progressive volume loss. Degeneration of cerebellum HP:0006839 UMLS:C0740279 UMLS:C4020873 Atrophic cerebellum Cerebellar atrophy is defined as a cerebellum with initially normal structures, in a posterior fossa with normal size, which displays enlarged fissures (interfolial spaces) in comparison to the foliae secondary to loss of tissue. Cerebellar atrophy implies irreversible loss of tissue and result from an ongoing progressive disease until a final stage is reached or a single injury, e.g. an intoxication or infectious event. HP:0007072 HP:0001272 UMLS:C0262404 SNOMEDCT_US:95646004 Abnormal cerebellum morphology