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JPTM > Volume 43(5); 2009 > Article
The Korean Journal of Pathology 2009;43(5): 482-488.
doi: https://doi.org/10.4132/KoreanJPathol.2009.43.5.482
Extramedullary B Lymphoblastic Crisis of CML, Presenting as a Leptomeningeal Tumor: A Case Report.
Hoiseon Jeong, Bongkyung Shin, Sook Young Bae, Sangho Lee, Youngjune Ryu, Hankyeom Kim, Insun Kim
1Department of Pathology, Korea University Guro Hospital, Seoul, Korea. iskim@korea.ac.kr
2Department of Laboratory Medicine, Korea University Guro Hospital, Seoul, Korea.
We report here on a rare case of a patient who presented with an extramedullary B lymphoblastic crisis as an initial manifestation of chronic myelogenous leukemia (CML). A 71-year-old man visited the emergency room due to suddenly developed dysarthria and right side weakness. Emergency craniotomy was done under the presumptive diagnosis of subdural hemorrhage. During the operation, a poorly demarcated firm mass was identified in the leptomeningeal space. Microscopically, the majority of the tumor was composed of monotonous immature cells with blast morphology, and these cells were immunoreactive for TdT, CD34, CD10 and CD20, indicating the precursor B-cell phenotype. The peripheral area of the tumor consisted of myeloid cells in various stages of maturation, and these cells were reactive for myeloperoxidase, chloroacetate esterase, CD43 and CD15. FISH analysis using the LSI bcr-abl dual color probe showed gene fusion signals in both the B-lymphoblasts and myeloid cells. The peripheral blood and bone marrow findings were consistent with CML with no evidence of a blast crisis. Cytogenetic study of the bone marrow demonstrated the 46, XY, t(9;22)(q34;q11) chromosome. A diagnosis of extramedullary B lymphoblastic blast crisis in a patient with Philadelphia chromosome-positive CML was made. Despite treatment, the patient died 3 months after he was diagnosed.
Key Words: Blast crisis; Chronic myelogenous leukemia; Fluorescent in situ hybridization; Philadelphia chromosome; Leptomeninges