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Microgranular acute promyelocytic leukemia--a case with multiple Auer rods demonstrable only after staining for
Abstract:
In the past several years there has been increasing recognition of the microgranular variant of acute promyelocytic leukemia (APL). This variant is easily mistaken for other types of acute non-lymphocytic leukemia. Its recognition is important because it carries the same high risk of disseminated intravascular coagulation as typical APL. An important clue to the correct diagnosis is the recognition of small numbers of characteristic cells containing multiple Auer rods. This report presents a case in which such Auer-body-containing cells were demonstrable in the marrow only after staining for chloroacetate esterase. They were not apparent with Wright's stain or Sudan black B. The case also highlights the occurrence of variant APL in children and adolescents.
Insights
The microgranular variant of acute promyelocytic leukemia (APL) can be misdiagnosed. Chloroacetate esterase staining aids in identifying characteristic cells, crucial for managing coagulopathy risks.
Area of Science:
- Hematology
- Oncology
- Leukemia Research
Background:
- The microgranular variant of acute promyelocytic leukemia (APL) is increasingly recognized.
- This subtype can be misdiagnosed as other acute non-lymphocytic leukemias.
- It shares the high risk of disseminated intravascular coagulation (DIC) seen in typical APL.
Observation:
- Characteristic cells with multiple Auer rods are key diagnostic clues.
- In a presented case, these Auer-body-containing cells were only visible with chloroacetate esterase staining.
- Wright's stain and Sudan black B did not reveal these diagnostic cells.
Findings:
- Chloroacetate esterase staining is vital for diagnosing the microgranular variant of APL.
- Auer rods may be obscured with standard staining methods.
- Variant APL can occur in pediatric and adolescent populations.
Implications:
- Improved diagnostic accuracy for microgranular APL, especially in challenging cases.
- Timely diagnosis facilitates appropriate management and reduces risks like DIC.
- Highlights the importance of specialized staining techniques in hematopathology.