A four year old boy was admitted with a history of abdominal pain and fever for two months maculo popular rash for ten days, and dry cough, dyspnea and wheezing for three days. One examination liver and spleen were enlarged 4 cm and 3 cm respectively below the costal margins. His hemoglobin was 10.0 g/dl, platelet count 37x 109/L and total leukocyte count 70 x 109L, which included 80% eosinophils Bone marrow examination revealed a cellular marrow comprising of 45% blasts and 34% Eosinophils and eosinophilic precursors. The blasts stained negative for myeloperoxidase and non-specific esterase and were positive for CD19, CD10, CD22 and CD20. Which of the following is the most likely diagnosis?
A four year old boy was admitted with a history of abdominal pain and fever for two months maculo popular rash for ten days, and dry cough, dyspnea and wheezing for three days. One examination liver and spleen were enlarged 4 cm and 3 cm respectively below the costal margins. His hemoglobin was 10.0 g/dl, platelet count 37x 109/L and total leukocyte count 70 x 109L, which included 80% eosinophils Bone marrow examination revealed a cellular marrow comprising of 45% blasts and 34% Eosinophils and eosinophilic precursors. The blasts stained negative for myeloperoxidase and non-specific esterase and were positive for CD19, CD10, CD22 and CD20. Which of the following is the most likely diagnosis?
💡 Explanation
## **Core Concept**
The question describes a pediatric patient presenting with a combination of symptoms including abdominal pain, fever, rash, respiratory distress, hepatosplenomegaly, anemia, thrombocytopenia, leukocytosis with eosinophilia, and a bone marrow showing blasts with specific immunophenotypic markers. This clinical picture suggests a hematological malignancy.
## **Why the Correct Answer is Right**
The patient's presentation with blasts in the bone marrow, specific immunophenotypic markers (CD19, CD10, CD22, and CD20 positivity), and clinical features such as hepatosplenomegaly and eosinophilia points towards **B-cell Acute Lymphoblastic Leukemia (B-ALL)**. B-ALL is characterized by the clonal proliferation of lymphoid blasts in the bone marrow, which express B-cell lineage markers. The presence of eosinophilia and the specific immunophenotype are consistent with a subtype of B-ALL.
## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is not provided, but typically, incorrect options might include other types of leukemia or lymphoma that do not match the immunophenotypic markers and clinical presentation described.
- **Option B:** Similarly, without the specific text, one can infer that any option not aligning with B-ALL (e.g., Acute Myeloid Leukemia (AML), T-cell ALL) would be incorrect based on the markers provided (e.g., myeloperoxidase and non-specific esterase negativity, specific B-cell markers positivity).
- **Option C:** This would be incorrect if it suggested a diagnosis not supported by the immunophenotypic markers and clinical findings presented.
- **Option D:** Likewise, this option would not align with the diagnosis of B-ALL based on the provided clinical and laboratory information.
## **Clinical Pearl / High-Yield Fact**
A key point to remember is that **B-cell Acute Lymphoblastic Leukemia (B-ALL)** often presents with **B-cell specific markers** such as CD19, CD10, CD22, and sometimes CD20. Eosinophilia can be seen in some cases of ALL, particularly in those with specific genetic abnormalities. The clinical presentation can be varied, including systemic symptoms like fever, abdominal pain, and hepatosplenomegaly due to organ infiltration by leukemic cells.
## **Correct Answer:** C. B-cell Acute Lymphoblastic Leukemia (B-ALL).
✓ Correct Answer: C. Acute lymphoblastic leukemia with hypereosinophilic syndrome
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