Abstract
A case of massive crystal-storing histiocytosis with extensive involvement of the subcutaneous adipose tissue in a 61-year-old caucasian woman with a lymphoplasmacytic lymphoma (immunocytoma) in transformation to a large cell lymphoma is presented. Paraffin-section immunohistochemistry demonstrated a monoclonal IgM/ kappa immunphenotype of the lymphoma cells and revealed IgM/kappa and, to a lesser extent, IgG/lambda in the crystal-containing histiocytes. Ultrastructurally, the electron dense intracytoplasmic crystals had variables shapes, were occasionally membrane-bound and measured up to 6 microns. The finding are briefly discussed.
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