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Primary cutaneous extramedullary plasmacytoma secreting lambda IgG

R Llamas-Martin1, C Postigo-Llorente, F Vanaclocha-Sebastian

  • 1Department of Dermatology, 12 Octubre University Hospital, Madrid, Spain.

Clinical and Experimental Dermatology
|July 1, 1993
PubMed
Summary
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This study describes a rare case of primary cutaneous extramedullary plasmacytoma in an adult male. The tumor cells uniquely expressed intracytoplasmic monoclonal lambda IgG during relapse, an unusual immunocytochemical finding.

Area of Science:

  • Oncology
  • Dermatology
  • Immunology

Background:

  • Extramedullary plasmacytomas are rare plasma cell tumors.
  • Primary cutaneous extramedullary plasmacytoma originates in the skin without systemic involvement.
  • Diagnosis requires histopathological, electron microscopic, and immunocytochemical evaluation.

Observation:

  • An adult male presented with a skin tumor on his left arm.
  • Initial studies confirmed primary cutaneous extramedullary plasmacytoma, excluding multiple myeloma and other conditions.
  • A relapse occurred 2.5 years post-treatment.

Findings:

  • Tumor cells expressed monoclonal lambda IgG at the intracytoplasmic level during relapse.
  • This intracytoplasmic expression of monoclonal lambda IgG is an unusual finding in this condition.

Related Experiment Videos

  • Immunocytochemical analysis is crucial for characterizing plasma cell neoplasms.

    • Implications:

    • This case expands the understanding of extramedullary plasmacytoma immunophenotypes.
    • Highlights the importance of detailed immunocytochemical analysis in diagnosing and monitoring rare tumors.
    • Further research may elucidate the significance of intracytoplasmic immunoglobulin expression in tumor behavior.