Microscopic Appearance and Classification

FIGURE 3-1 (see Color Plate)

Blood vessel from a bone marrow biopsy specimen indicating primary amyloidosis. The specimen was stained with Congo red dye and viewed with a polarizing light source, producing the characteristic apple-green birefringence. In more than half of patients, results of bone marrow testing are positive for amyloidosis. (From Kyle [4]; with permission.)

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