Amyloid diagnostics in rheumatic diseases

Der Pathologe
C Röcken, J Ernst


Amyloid is a pathological protein deposit in tissue which has a red eosin color when the slice preparation is stained with traditional hematoxylin and eosin and after Congo red staining under polarized light exhibits a characteristic apple-green polarization color. Over 26 different autologous physiological proteins have been described that can form amyloid. In surgical pathology, immunoglobulin light chain-associated AL amyloidosis is the most frequent generally occurring amyloidosis, followed by hereditary and nonhereditary ATTR amyloidosis and AA amyloidosis. AA amyloidosis mostly develops subsequent to chronic infectious or inflammatory underlying disease and can represent a potentially life threatening complication. The spectrum of causes for AA amyloidosis has changed in the past few decades and is now determined by chronic rheumatic diseases and hereditary periodic fever syndromes. Early diagnosis of an amyloidosis and its correct classification continue to pose a great challenge. Precise classification of the amyloid and amyloidosis is essential for prognosis assessment and treatment planning. In addition to anti-inflammatory management of AA amyloidosis, specific treatment strategies may possibly become available in th...Continue Reading


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