Orbital Plasmacytoma, An Uncommon Presentation of Advanced Multiple Myeloma.

Multiple myeloma (MM) represents 10% of malignant haematologic disease, 13% of which presents plasmacytomas (mostly in the axial skeleton).Orbital plasmacytoma is an uncommon presentation of MM and only 1% of orbital tumours are plasmacytomas. Proptosis is the most common symptom.Although the majority of MM cases demonstrate hypergammaglobulinaemia, non-secretory MM is described as constituting less than 5% of cases.