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[CD56-positive adult T-cell leukemia manifested by abnormal lung shadows]
M Koike1, I Sekikawa, Y Yoshioka
1Department of Internal Medicine, Juntendo Izunagaoka Hospital.
Summary
This case study details a 54-year-old woman diagnosed with adult T-cell leukemia (ATL). Unusual findings included CD56 expression on leukemic cells and lung infiltrates potentially caused by ATL.
Area of Science:
- Hematology
- Oncology
- Immunology
Background:
- Adult T-cell leukemia (ATL) is a lymphoproliferative malignancy associated with Human T-lymphotropic virus type 1 (HTLV-1).
- ATL typically presents with diverse clinical manifestations, including skin lesions, lymphadenopathy, and visceral organ involvement.
Observation:
- A 54-year-old woman presented with persistent cough, fever, and progressive lung infiltrates unresponsive to antibiotics.
- Physical examination revealed lymphadenopathy and hepatosplenomegaly.
- Peripheral blood analysis identified atypical lymphoid cells, and serological tests confirmed HTLV-1 infection.
Findings:
- Flow cytometry analysis of lymph node cells showed positivity for CD2, CD3, CD4, CD5, CD56, and HLA-DR, confirming the diagnosis of ATL.
- The presence of the natural killer cell marker CD56 on leukemic cells was an unusual finding.
- Abnormal lung shadows were suspected to be due to leukemic cell infiltration.
Implications:
- This case highlights the importance of considering ATL in patients with unexplained pulmonary infiltrates and lymphoproliferative disorders.
- The expression of CD56 on leukemic cells in ATL may indicate a distinct subset with unique biological or clinical characteristics.
- Further research into the role of CD56 in ATL pathogenesis and prognosis is warranted.