Case Report
Granular Acute Lymphoblastic Leukemia in Adults: Report of a Case and Review of the Literature
Abstract
The diagnosis of granular acute lymphoblastic leukemia (ALL) can be problematic as the cytoplasmic granules found in many blast cells may mimic those seen in acute myelogenous leukemia (AML). This rare variant of B-cell ALL is more commonly diagnosed in children, but may occur in adults. We report a case of granular B-ALL in a 56-year-old female and review the literature.
Key Points
* Granular lymphoblastic leukemia is most commonly seen in children, but the diagnosis should be considered in adults as well.
* Cases of granular lymphoblastic leukemia in adults may look morphologically similar to acute myelogenous leukemia; thus, morphology alone may lead to misdiagnosis in these patients.
* There is great variation in patient age, in presentation blast count and in blast morphology in the reported cases, which highlights the importance of histochemical and immunophenotypic studies in these cases.
* We report the first double Philadelphia chromosome found in an adult with granular acute lymphoblastic leukemia (ALL). Philadelphia chromosome is an indicator of poor prognosis in childhood ALL, but its significance in granular adult ALL is as yet unknown.
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