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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Der Nervenarzt 71 (2000), S. 44-49 
    ISSN: 1433-0407
    Keywords: Schlüsselwörter Frontotemporale Demenz ; Pick-Krankheit ; präsenile Demenz ; Zerebrale Bildgebung ; Key words Frontotemporal dementia ; Pick's disease ; Presenile Dementia ; Neuroimaging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary The term frontotemporal dementia is used to describe a primary degenerative form of dementia, which is characterized by typical clinical, neuropsychological, radiological and neuropathological features. Its onset is usually before the age of 65 years; manifestations before the age of 30 years have rarely been described. We report the case of a 22-year old man, who showed symptoms of behavioural disorder such as social retreat, lack of initiative, mental rigidity, progressive reduction of speech, and stereotyped behaviour. The neuropsychological examination revealed disorders of the executive functions. The cerebral MRI investigations showed bifrontal atrophies corresponding with hypoperfusion areas on the SPECT. Other investigations including EEG, evoked potentials, duplex ultrasonography, cerebral angiography, laboratory tests and cerebrospinal fluid were normal. In the present case report we discuss the clinical presentation of frontotemporal dementia with early onset.
    Notes: Zusammenfassung Als frontotemporale Demenz (FTD) wird in der Literatur eine primär degenerative Demenzform bezeichnet, die durch charakteristische klinische, neuropsychologische, radiologische und neuropathologische Befunde gekennzeichnet ist. Die Krankheit manifestiert sich überwiegend vor dem 65. Lebensjahr; ein Beginn vor dem 30. Lebensjahr ist bisher äußerst selten beschrieben worden. Wir stellen einen bei Krankheitsbeginn 22-jährigen Mann vor, der klinisch durch sozialen Rückzug, reduzierten Eigenantrieb, geistige Starrheit, Sprachverarmung und Stereotypien auffiel. Neuropsychologisch imponierten Störungen der Exekutivfunktionen. In MRT-Verlaufsuntersuchungen war eine bilaterale, frontal und temporal-anterior betonte Hirnsubstanzminderung nachweisbar. Damit korrespondierten im Hirn-SPECT ausgeprägte Minderperfusionen. Die übrige Diagnostik (EEG, evozierte Potentiale, Duplexsonographie hirnversorgender Gefäße, zerebrale Angiographie, Serologie, Liquor, Humangenetik) erbrachte unauffällige Befunde. Vor dem Hintergrund dieser Kasuistik diskutieren wir das klinische Bild der frontotemporalen Demenz.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-0794
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract During the Martian landings the descent engine plumes on Viking Lander 1 (VL-1) and Viking Lander 2 (VL-2) eroded the Martian surface materials. This had been anticipated and investigated both analytically and experimentally during the design phase of the Viking spacecraft. This paper presents data on erosion obtained during the tests of the Viking descent engine and the evidence for erosion by the descent engines of VL-1 and VL-2 on Mars. From these and other results, it is concluded that there are four distinct surface materials on Mars: (1) drift material, (2) crusty to cloddy material, (3) blocky material, and (4) rock.
    Type of Medium: Electronic Resource
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