The micrograph shows abundant (malignant) plasma cells with the occasional Mott cell, a plasma cell with an intracytoplasmic Russell bodies (an eosinophilic uniformly staining membrane bound body which contains immunoglobulin).
Other features of plasmacytomas (not apparent on the image) are:
a prominent perinuclear hof (large Golgi bodies), and
Dutcher bodies (intranuclear inclusions).
The plasma cells have the characteristic "clockface nuclei".
Multiple myeloma (which is diagnosed using several clinical criteria) is, histologically, a plasmacytoma.
{{Information |Description={{en|1=Micrograph of a '''plasmacytoma'''. H&E stain. The micrograph shows abundant (malignant) plasma cells with the occasional ''Mott cell'', a plasma cell