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Transitory T-lymphoblastic leukemoid reaction in a neonate with Down syndrome
M Fernandez de Castro1, S Salas, A Martinez
1LaPaz Hospital, Madrid, Spain.
Insights
A transient leukemoid reaction in a neonate with Down syndrome resolved spontaneously. This T lymphoblastic proliferation, identified via multiple methods, highlights the need for cytogenetic studies to differentiate from true leukemia.
Area of Science:
- Hematology
- Oncology
- Pediatrics
Background:
- Down syndrome (trisomy 21) is associated with an increased risk of hematologic malignancies.
- Neonatal leukemoid reactions can mimic acute leukemia, posing diagnostic challenges.
Observation:
- A neonate diagnosed with Down syndrome presented with a transient leukemoid reaction.
- Morphological, cytochemical, and immunological analyses identified the blastic proliferation as T lymphoblastic, specifically prethymocytes.
Findings:
- The condition exhibited spontaneous complete remission within 8 weeks.
- Cytogenetic analysis revealed no abnormalities beyond trisomy 21.
- Distinguishing this transient reaction from true leukemia is crucial.
Implications:
- Cytogenetic studies are vital for differentiating transient leukemoid reactions from true leukemias in newborns with Down syndrome.
- In vitro growth patterns of blood and bone marrow may offer additional diagnostic utility.
Abstract:
A transient leukemoid reaction in a neonate with Down syndrome is reported. The blastic proliferation was identified as T lymphoblastic in an early stage of maturation (prethymocytes) using morphological, cytochemical, and immunological methods. A spontaneous complete remission occurred in 8 weeks. No additional cytogenetic alterations were found, except for those concerning chromosome 21. Other cases reported in the literature reveal that cytogenetic studies may be useful to distinguish these transient leukemic reactions from true leukemias in newborns with Down syndrome. The in vitro growth pattern of peripheral blood and bone marrow may also be useful for this purpose.