PMC4439975_01
27-year-old woman with AL amyloidosis - bone marrow trepanobiopsy. A) Hematoxylin and eosin staining - homogenous amyloid masses in the bone marrow. B) Congo red staining - amyloid stains an orange red. (Courtesy of Prof. Mieczyslaw Komarnicki MD, PhD)
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Bone marrow biopsy with following Congo red staining and immunohistochemical analysis were done (Fig. 1).