1757
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Interstitial and diffuse infiltration by an plasma cell neoplasia and nodular bone marrow infiltration by small lymphocytic lymphoma (SLL, CD20).
Bone Marrow
CD20 (L26)
82 years
female
Anemia. Suspicion of IgG-kappa Plasmocytoma. Lymphocytosis.
The lymphoid infiltration shows a strong expression for CD20 leading to the diagnosis of small lymphocytic B-cell lymphoma (B-CLL).
Hypercellular bone marrow with an irregularily distributed megakaryopoesis without cytologic atypia. Partial displacement of the erythropoesis. Partial maturational disruption of the myelopoesis. Nodular infiltration by a small cell lymphocytic proliferation and diffuse, interstitial infiltration by an asynchronous plasma cell proliferation (which can be appreciated in the Giemsa stain). CD38 and MUM1 confirm the infiltration by plasma cells. The immunohistochemical double staining for kappa (brown) and lambda (red) light chains shows a kappa light chain restriction with single lambda positive cell as an internal positive control.
Manuel Schlageter, University of Basel
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