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Unveiling Multiple Myeloma Through a Bulky Humerus Plasmacytoma

Unveiling Multiple Myeloma Through a Bulky Humerus Plasmacytoma
#00064764
Author: David Israel Garrido, MD; Eloisa Riva, MD
Category: Lymphoma: Mature B-cell and Plasma cell Neoplasms > Plasma Cell Neoplasm
Published Date: 05/28/2025

A 73-year-old patient diagnosed with multiple myeloma presented with an IgG monoclonal component level of 6.3 g/L, a bone marrow infiltration of plasma cells at 15%, and myeloma-defining features including anemia, lytic bone lesions, and a bulky plasmacytoma in the humeral region (Figure A and B) that led to a pathological fracture and compression of surrounding tissues (Figure C and D).

She underwent a treatment regimen consisting of Bortezomib, Lenalidomide, and dexamethasone, complemented by localized radiotherapy. This was followed by consolidation therapy involving high-dose melphalan and autologous stem cell transplantation, which resulted in a complete response with complete eradication of the tumor mass (as shown in Figure E). As of today, she has been on lenalidomide maintenance therapy for 17 months.

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