Oral Lesion as Unusual First Manifestation of Multiple Myeloma: Case Reports and Review of the Literature

Figure 2

Extramedullary plasmacytoma, microscopic features. (a) The submucosa was heavily infiltrated by atypical plasma cells (hematoxylin eosine stain × 20, Case A). (b) MUM-1 + atypical plasma cells (nuclear staining pattern) (×40). (c) Some of the neoplastic plasma cells (pleomorphic or showing atypical mitosis stain × 63, Case B). (d) CD138 + atypical plasma cells (membranous staining pattern, ×40, Case B).

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