Morphologic confounders and CD19 negativity in a case of hairy cell leukemia.

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Pulkit Rastogi
Sreejesh Sreedharanunni *
Uday Yanamandra
Man Updesh Singh Sachdeva
Neelam Varma
(*) Corresponding Author:
Sreejesh Sreedharanunni | sreejesh.s@pgimer.edu.in

Abstract

Objectives:We report a case of hairy cell leukemia (HCL) initially misdiagnosed as plasma cell dyscrasia due to various clinical, morphological and immunophenotypic confounders.

Methods and results:In a patient diagnosed of marrow plasmacytosis and serum monoclonal protein elsewhere and referred to our hospital, morphological evaluation of bone marrow aspirate smears and trephine biopsy, immunophenotyping, and molecular testing (BRAFV600E mutation) were done. Clinically, the patient was asymptomatic, bone marrow revealed plasmacytosis, mastocytosis and lymphocytosis with a few “hairy” cells. Immunophenotyping revealed features of HCL with aberrant CD10 expression and a subclone of CD19neg cells. A diagnosis of HCL with reactive plasmacytosis and mast cell hyperplasia was made and confirmed by immunophenotyping and molecular studies.

Conclusion:Hematopathologists must be aware of various confounding factors and should judiciously use flow cytometric and molecular studies for attaining a proper diagnosis of HCL. We also report a very rare immunophenotypic aberrancy (CD 19 negativity) in HCL

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Author Biographies

Pulkit Rastogi, Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh, India- 160012

DM fellow- Hematopathology, Department of Hematology,

Sreejesh Sreedharanunni, Postgraduate Institute of Medical Education and Research, Chandigarh, India-160012

Assistant Professor, Dept of Hematology

Uday Yanamandra, Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh, India- 160012

Senior Resident, Clinical Hematology Division, Department of Internal Medicine

Man Updesh Singh Sachdeva, Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh, India- 160012

Additional Professor, Department of Hematology

Neelam Varma, Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh, India- 160012

Professor and Head, Department of Hematology

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