Abstract
The accurate diagnosis of amyloidosis is essential. Delay in diagnosis results in significant adverse consequences. Likewise, making the wrong diagnosis results in unwarranted therapy with marked adverse effects.
Understanding the appropriate use of stains to confirm or exclude a diagnosis of amyloidosis is crucial for the surgical pathologist. In some instances, the material that suggests amyloid may be in very small amounts deposited in various organs, and this may pose significant diagnostic challenges.
While electron microscopy is the gold standard to confirm the presence of amyloid, it is seldom that the tissue available for evaluation to surgical pathologists (excluding kidney) is properly fixed for ultrastructural evaluation. Stains then become the main diagnostic technique available. There are important considerations when these stains are used for diagnosis or confirmation of amyloid deposits. This chapter addresses differential diagnosis with emphasis on a practical algorithmic approach.
It also discusses entities in the differential diagnosis and how to distinguish these. The challenge to diagnose amyloid is increased when non-renal tissue is the specimen under consideration, as the routine diagnostic biopsy is generally fixed in formalin and embedded in paraffin. While electron microscopic examination of tissue retrieved from a paraffin block may be sufficient for a definitive diagnosis of amyloidosis, it is preferable to properly fix tissue for ultrastructural evaluation to preserve diagnostic features. Immunofluorescence, immunohistochemistry, and mass spectroscopy can be used to determine the type of amyloid, and these techniques play important roles in a variety of circumstances.
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Herrera, G.A., Turbat-Herrera, E.A. (2015). Differential Diagnosis of Amyloid in Surgical Pathology: Organized Deposits and Other Materials in the Differential Diagnosis of Amyloidosis. In: Picken, M., Herrera, G., Dogan, A. (eds) Amyloid and Related Disorders. Current Clinical Pathology. Humana Press, Cham. https://doi.org/10.1007/978-3-319-19294-9_9
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