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Updated: Aug 30, 2026

Performing and Processing FNA of Anterior Fat Pad for Amyloid
Published on: October 30, 2010
Bone marrow core biopsy specimens in AL (primary) amyloidosis. A morphologic and immunohistochemical study of 100
Niall Swan1, Martha Skinner, Carl J O'Hara
1Department of Pathology and Laboratory Medicine, Amyloid Treatment and Research Program, Boston University School of Medicine, 774 Albany St, Boston, MA 02118, USA.
Abstract:
We retrospectively reviewed 100 bone marrow core biopsy specimens from patients with AL (primary) amyloidosis. The morphologic and immunohistochemical features were assessed by standard histochemical stains (H&E, periodic acid-Schiff, Congo red) and immunohistochemical stains for light chain immunoglobulins. Bone marrow core biopsy revealed a plasma cell dyscrasia in 83% (lambda, 65; kappa, 18) of cases. Amyloid deposits were observed in 60% of the bone marrow core biopsy specimens and, when present, were detected most often in blood vessel walls only (39/60). However, if present, interstitial amyloid deposition was significantly more associated with patients with a monoclonal kappa light chain gammopathy (P = .04). Through the careful analysis of standard histochemical and immunohistochemical stains, bone marrow core biopsy provides essential diagnostic information in cases of AL amyloidosis.
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