Open AccessReliability and interobserver variability of evans' index and disproportionately enlarged subarachnoid space hydrocephalus as diagnostic criteria for idiopathic normal pressure hydrocephalus
Author(s) -
Kiyoshi Takagi,
Ryota Watahiki,
Tatsuya Machida,
Kenji Onouchi,
Kazúo Kato,
Masaharu Oshima
Publication year - 2020
Publication title -
asian journal of neurosurgery
Language(s) - English
Resource type - Journals
ISSN - 1793-5482
DOI - 10.4103/ajns.ajns_354_19
Subject(s) - medicine , ventriculomegaly , hydrocephalus , neurosurgery , magnetic resonance imaging , subarachnoid space , normal pressure hydrocephalus , radiology , nuclear medicine , dementia , cerebrospinal fluid , disease , pregnancy , fetus , genetics , biology
The image diagnosis of idiopathic normal-pressure hydrocephalus (iNPH) is based on the ventriculomegaly, whose criterion is an Evans' Index (EI) >0.3. Recently, disproportionately enlarged subarachnoid space hydrocephalus (DESH) has been proposed as a morphological characteristic to iNPH. Several studies cast doubt on the reliability of these criteria in the diagnosis of iNPH. Furthermore, interobserver differences of these criteria have not yet been investigated. The objective of this study was to assess the diagnostic reliability and interobserver variability of EI and DESH.