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64010 Pathology

Biopsy of a reasonably well-demarcated mass of the nasopharynx from a 30 year old man, demonstrates a plasma cell proliferation. Serum electrophoresis shows a small monoclonal IgG spike. Bone marrow evaluation fails to demonstrate plasma cell proliferation and no lesions are seen on extensive skeletal x-rays. Which of the following is the most likely diagnosis?

AHeavy chain disease
BMonoclonal gammopathy of undetermined significance
CMultiple myeloma
DPlasmacytoma
Pathology
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