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Lymphoproliferative process with natural killer cell phenotype. Histopathologic, ultrastructural, and surface marker

P Abenoza1, J Parkin, S Bowers

  • 1Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis.

Archives of Pathology & Laboratory Medicine
|August 1, 1993
PubMed

Insights

This study details a rare spleen-based lymphoproliferative disorder. The condition involves abnormal natural killer cells, causing persistent thrombocytopenia without affecting blood or bone marrow.

Area of Science:

  • Hematology
  • Immunology
  • Oncology

Background:

  • Lymphoproliferative disorders can present with diverse clinical and immunophenotypic features.
  • Splenic and hepatic involvement are observed in certain hematologic malignancies.
  • Understanding the immunophenotype of proliferating cells is crucial for diagnosis and classification.

Observation:

  • A case of lymphoproliferation with persistent thrombocytopenia and significant spleen involvement was analyzed.
  • The affected spleen and liver showed abnormal cell proliferation.
  • Peripheral blood and bone marrow were not involved in this process.

Findings:

  • Proliferating cells lacked cytoplasmic azurophilic granules and displayed characteristic ultrastructural features.
  • Immunophenotypic analysis revealed the cells expressed markers of true natural killer (NK) cells (CD2, CD56, CD45, CD7, CD16, CD33).
  • This suggests a distinct entity of true NK cell proliferation originating in the spleen.

Implications:

  • This case expands the spectrum of lymphoid proliferations involving natural killer cells.
  • Further research is needed to clarify the relationship of this splenic NK cell proliferation to other lymphoid disorders.
  • Accurate immunophenotypic characterization is vital for diagnosing and managing such rare conditions.

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