Acute Mast Cell Leukemia With Complex Karyomorphism and Karyotypes

Area of Science:

• Hematology
• Oncology

Background:

• Mast cell leukemia (MCL) is an extremely rare and aggressive hematologic malignancy.
• Diagnosis often presents challenges due to its rarity and varied clinical manifestations.

Observation:

• A 51-year-old woman presented with prolonged fever, edema, serous effusions, and splenomegaly.
• Peripheral blood and bone marrow smears revealed significant numbers of abnormal cells with distinct morphological features.
• Flow cytometry and bone marrow biopsy confirmed diffuse infiltration by atypical mast cells.

Findings:

• The patient exhibited moderate anemia and severe thrombocytopenia.
• Abnormal cells were negative for myeloperoxidase but positive for periodic acid-Schiff staining.
• Immunophenotyping showed CD117, CD30, and CD25 positivity, with a negative KIT gene mutation and complex abnormal karyotypes.

Implications:

• This case highlights the diagnostic complexities and aggressive nature of mast cell leukemia.
• Early recognition and understanding of MCL's unique cellular and molecular characteristics are crucial for patient management.
• Further research into the pathogenesis and treatment of MCL is warranted given its poor prognosis.