Acute eosinophilic leukemia with a translocation (10p+;11q-)

Area of Science:

• Hematology
• Oncology
• Cytogenetics

Background:

• Distinguishing eosinophilic leukemias from hypereosinophilic syndromes is clinically challenging.
• Chromosomal abnormalities in eosinophils are crucial for diagnosing eosinophilic malignancies.

Observation:

• A 27-year-old woman presented with sudden onset hepatosplenomegaly, lymphadenopathy, and marked eosinophilia in blood and bone marrow.
• Cytological examination revealed predominant abnormal cells, identified as large pseudo Pelger eosinocytes.

Findings:

• The identification of a clonal chromosomal anomaly, specifically t(10;11)(p14;q21), within the abnormal eosinophils was established.
• This chromosomal abnormality strongly supported the diagnosis of acute eosinophilic leukemia.

Implications:

• The findings highlight the diagnostic significance of clonal chromosomal abnormalities in eosinophils for acute eosinophilic leukemia.
• This case underscores the importance of integrating cytogenetic analysis into the diagnostic workup of hypereosinophilic conditions.
• Early and accurate diagnosis through cytogenetic markers can facilitate timely and appropriate therapeutic interventions for eosinophilic leukemia.