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[A case of solitary myeloma (BJ-lambda) showing marked morphological changes]
Gan No Rinsho. Japan Journal of Cancer Clinics
|April 1, 1983
Summary
This case report details a rare solitary plasmacytoma that transformed into aggressive plasma cell sarcoma. The advanced malignancy led to widespread metastasis and patient death despite treatment.
Area of Science:
- Oncology
- Pathology
- Immunohistochemistry
Background:
- Solitary plasmacytoma is a rare plasma cell neoplasm.
- This report documents a 5-year clinical progression of a sternal tumor.
Observation:
- A 49-year-old male presented with a sternal mass diagnosed as solitary well-differentiated plasmacytoma (BJ-lambda).
- The tumor recurred as a poorly differentiated plasmacytoma, later progressing to aggressive plasma cell sarcoma with abdominal metastasis and ascites.
- Autopsy revealed widespread dissemination of giant and bizarre myeloma cells in multiple organs, excluding bones other than the sternum.
Findings:
- The initial well-differentiated plasmacytoma evolved into a poorly differentiated form and ultimately a high-grade plasma cell sarcoma.
- Immunoelectron microscopy confirmed the plasma cell origin of the advanced tumor cells.
- The patient succumbed to cachexia secondary to widespread metastatic disease.
Implications:
- This case highlights the potential for solitary plasmacytoma to dedifferentiate and metastasize aggressively.
- Understanding the progression pathway is crucial for early detection and management of advanced plasma cell neoplasms.
- Further research into the molecular mechanisms driving plasmacytoma dedifferentiation may reveal novel therapeutic targets.