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B-ALL with CD34 Negative and Surface Immunoglobulin Light Chain Restricted Expression.
Clinical Laboratory
|April 10, 2025
Summary
Diagnosing B-cell acute lymphoblastic leukemia (B-ALL) can be challenging due to overlapping morphology with other lymphomas. This case highlights difficulties in distinguishing mature from immature B cells based on immunophenotypic markers.
Area of Science:
- Hematology
- Oncology
- Immunophenotyping
Background:
- Morphologic features of acute lymphoblastic leukemia (ALL) often overlap with high-grade B-cell lymphomas (HGBL) and mature B-cell lymphomas.
- Distinguishing blastoid morphology presents a significant diagnostic challenge in hematopathology.
Observation:
- A case of B-ALL presented with specific immunophenotypic markers: surface IgD and immunoglobulin light chain Kappa restricted expression.
- Partial expression of CD13 and CD33, with CD34 negativity, was noted in the malignant cells.
Findings:
- The immunophenotypic profile in this B-ALL case did not definitively distinguish between a mature or immature B-cell stage.
- Lymphoblasts exhibited features that were difficult to differentiate from mature B cells.
Implications:
- This case underscores the diagnostic complexities in B-ALL, particularly when morphology and immunophenotype are ambiguous.
- Refined diagnostic strategies may be needed for challenging cases of B-cell lymphomas and leukemia.
