A True Mimicker to Plasmacytoma Clinically, Radiologically, and Pathologically - A Rare Case Report.

Lympho plasmacytoma is distinct type of diffuse large B cell lymphoma predominantly seen in HIV-positive patients. The diagnosis of lympho plasmacytoma could be a challenge due to its overlapping characterizes with those of myeloma and lymphoma. We report a case of a 50-year-old man who initially presented with a painful solitary destructive lesion at the second lumbar vertebra. Clinico-pathological findings were consistent with a solitary plasmacytoma, and he was treated with definitive radiotherapy. Eight months after completing radiotherapy, he was found to have similar lesions at D4 vertebral body, multiple ribs, and pelvis. Subsequent biopsy confirmed lympho plasmacytoma. Because of its rarity and heterogeneous presentations, lympho plasmacytoma could easily be overlooked clinically and pathologically in immunocompetent patients. The diagnosis of lympho plasmacytoma should be considered when there is coexpression of myeloma and lymphoma immune markers.