has part has part characteristic of inheres in has modifier Cerebellar hypoplasia Cerebellar hypoplasia is a descriptive term implying a cerebellum with a reduced volume, but a normal shape and is stable over time. HP:0007053 Small cerebellum SNOMEDCT_US:16026008 Underdeveloped cerebellum Congenital cerebellar hypoplasia HP:0007038 HP:0006806 Hypoplasia of cerebellum HP:0006910 UMLS:C0266470 By prenatal ultrasound, cerebellar hypoplasia is diagnosed if the cerebellum measures more than two standard deviations below the mean. In adults, cerebellar hypoplasia is typically diagnosed by computer tomography or magnetic resonance imaging. Cerebellar hypoplasia can be diagnosed if there is a small cerebellum with fissures of normal size compared with the folia (this is a distinguishing characteristic compared with cerebellar atrophy). Cerebellar hypoplasia (CH) refers to an underdevelopment of the cerebellum. This category of cerebellar malformation is distinct from Dandy Walker malformation in that it does not involve a concurrent enlargement of the posterior fossa, and almost all individuals exhibit cognitive and motor impairments. HP:0001321 Hypoplastic cerebellum Aplasia/Hypoplasia of the cerebellum abnormal hypoplastic cerebellum