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

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.