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Updated: Apr 23, 2026

An Improved Method for Collection of Cerebrospinal Fluid from Anesthetized Mice
Published on: March 19, 2018
"Tear drops" in the cerebrospinal fluid: Correct by scatter, but pathognomonic by site
Reena Mittal1, Anita Chopra, Sushant Soni
1Laboratory Oncology Unit, Dr. BRAIRCH, All India Institute of Medical Sciences, Ansari Nagar, New Delhi-, 110029, India.
Abstract:
Extramedullary relapse in acute promyelocytic leukemia (APL) is rare, but occurs most commonly in central nervous system (CNS), generally in high-risk cases (total leucocyte count≥10,000/µL, atypical morphology or disseminated intravascular coagulation at presentation), and concomitant with bone marrow (BM) relapse. Here, we describe a case of APL who except for CD56 positivity was low risk but had a CNS relapse without concomitant BM involvement. Diagnosis of isolated CNS relapse was based on characteristic tear-drop pattern for CD45/side scatter plot on flow cytometry, a full compatible immunophenotype and cytomorphology in the cerebrospinal fluid. The case illustrates the value of the latter and the importance of including CD56 in risk assessment of APL.
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