Further rare and unusual dementias

Abstract

In the second of two articles on rare causes of dementia, the authors describe toxic, iatrogenic, nutritional, traumatic, metabolic, neoplastic and autoimmune causes of dementia. Disorders are graded according to their prevalence, to give an idea of the likelihood of their presentation. Guidance is given on the investigation of uncommon cognitive impairment and dementia, especially in early-onset illness.