Assertion: american neurosurgeon walter dandy | /r/CapableOf | describe the malformation
Facets:
value: in 1914
type: TEMPORAL
Source sentences:
text: In 1914, American neurosurgeon Walter Dandy and American paediatrician Kenneth Blackfan described the malformation as partial or complete absence of the cerebellar vermis, an enlarged fourth ventricle and hydrocephalus.