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The concepts of potentially reversible cognitive impairment in general, and the reversible dementias in particular, remain controversial. The prevalence of these conditions depends to a great extent on the definitions used and on the population studied. Also, the definition of those cases with potentially reversible conditions that actually do reverse remains a critical aspect in assessing these conditions.
In their article, Hejl et al1 present the results of a prospective study to investigate the prevalence of potentially reversible causes of cognitive decline in consecutive patients presenting to a tertiary medical centre memory clinic. The description that they provide of a large cohort provides an important contribution to our understanding of this condition. However, as was mentioned by the authors in the discussion, the rather high prevalence (19%) of potentially reversible causes detected …