RT Journal Article SR Electronic T1 Neuroimaging of Rapidly Progressive Dementias, Part 2: Prion, Inflammatory, Neoplastic, and Other Etiologies JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology SP 424 OP 431 DO 10.3174/ajnr.A3455 VO 35 IS 3 A1 A.J. Degnan A1 L.M. Levy YR 2014 UL http://www.ajnr.org/content/35/3/424.abstract AB SUMMARY: Most dementias begin insidiously, developing slowly and generally occurring in the elderly age group. The so-called rapidly progressive dementias constitute a different, diverse collection of conditions, many of which are reversible or treatable. For this reason, accurate identification and assessment of acute and subacute forms of dementia are critical to effective treatment; neuroimaging aids greatly in narrowing the diagnosis of these conditions. This second installment of a 2-part review of rapidly progressive dementias examines the use of imaging in an assortment of other etiologies in the differential diagnosis, from prion disease and neoplastic-related conditions to rare metabolic and other conditions such as Wernicke encephalopathy. In these clinical conditions, MR imaging has the potential to narrow this broad differential diagnosis and, at times, can definitively aid in the diagnosis of certain conditions on the basis of typical imaging patterns. CJDCreutzfeldt-Jakob diseaseLGlymphomatoid granulomatosisSREATsteroid-responsive encephalopathy with autoimmune thyroiditisSSPEsubacute sclerosing panencephalitis