Indian Journal of Pathology and Microbiology

: 2014  |  Volume : 57  |  Issue : 4  |  Page : 659--660

Anaplastic: Plasmablastic plasmacytoma of the vocal cord

Andleeb Abrari1, Vandana Bakshi2,  
1 Department of Pathology, Max Healthcare, New Delhi, India
2 ENT Practice, New Delhi, India

Correspondence Address:
Dr. Andleeb Abrari
K 29 F, SFS Flats, Saket, New Delhi -110017

How to cite this article:
Abrari A, Bakshi V. Anaplastic: Plasmablastic plasmacytoma of the vocal cord.Indian J Pathol Microbiol 2014;57:659-660

How to cite this URL:
Abrari A, Bakshi V. Anaplastic: Plasmablastic plasmacytoma of the vocal cord. Indian J Pathol Microbiol [serial online] 2014 [cited 2022 Jan 23 ];57:659-660
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We report a case of a laryngeal extra medullary plasmacytoma, with anaplastic morphology-in a nonimmune-compromised male patient - and emphasize the differentials to be considered and excluded, when dealing with an anaplastic or blastic plasmacytoma, which is a rare variant, for laryngeal location.

The patient, a 56-year-old, male, who presented with progressively worsening breathlessness and stridor was evaluated by flexible, followed by direct laryngoscopy, and found to have a nodular thickening of the right vocal cord, jeopardizing the airway and abutting the anterior commissure. A punch biopsy obtained was submitted for histopathology.

Microscopy revealed predominance of undifferentiated tumor cells with large vesicular nuclei, occasionally conspicuous nucleoli, and scant cytoplasm; a population of cells with plasmacytoid features were seen scattered - initially thought of as a tumor associated inflammatory reaction [Figure 1].{Figure 1}

The initial immunohistochemistry (IHC) panel, included broad spectrum cytokeratin (clone AE1/AE3), cytokeratin 5/6, leukocyte common antigen (LCA), c-kit (CD117), Synaptophysin, Chromogranin, CD56, Vimentin, Desmin, epithelial membrane antigen (EMA), Myogenin, CD34, Bcl2, CD99, S-100 and HMB 45. The infiltrating cells marked for CD56, focal EMA, CD117 and Vimentin. Rest of the markers were was negative.

The second phalanx of IHC markers included CD38, CD 138, CD20, MUM1, kappa and lambda light chains, CD30, CD3 and Ki67. Diffuse and strong expression of CD38, CD138, MUM-1, focal trace CD20, almost 100% kappa light chain restriction and 60% Ki67 proliferation index were observed [Figure 2].{Figure 2}

A histopathologic diagnosis of anaplastic/plasmablastic plasmacytoma was given.

Further work-up of the patient by imaging with computed tomography and magnetic resonance showed the disease to be limited to the right vocal cord. Absence of serum/urine paraprotein, finding of <5% reactive plasma cells in bone marrow, and normal skeletal survey essentially excluded a systemic (multiple) myeloma. The patient was also confirmed to be EBV sero-negative.

This patient was managed with XRT (local field irradiation), improved symptomatically, with complete resolution of the lesion on laryngoscopy and imaging, and is disease free at present and under close clinical surveillance.

Anaplastic/plasmablastic plasmacytoma is a quintessential undifferentiated round cell tumor. The high grade anaplastic cell morphology brings into the differential diagnosis, a plethora of malignancies including-lymphoma, melanoma, undifferentiated carcinoma, neuroendocrine tumor, rhabdomyosarcoma and neuroblastoma, all having vastly differing biologic potentials, prognoses, predicators and management protocols. [1],[2]

Even if the population of plasma cells is accompanying the undifferentiated cells- as was observed in this case - it cannot be presumed to be a presumptive evidence of plasmacytic differentiation/neoplasm, as a lympho-plasmacytic reaction is common enough in tumors of almost any lineage. [3]

As seen in this case the morphologically malignant cells expressed CD138, CD38, CD56, CD30, MUM1, were monotypic for kappa light chain and negative for LCA and CD20 - this profile favored a clonal plasma cell phenotype against marginal zone/plasmablastic lymphoma, which would have been strongly CD20 and LCA immunopositive. [4] Clinico-radiologic and biochemical work-up ruled out multiple myeloma as described preceding.

The other differentials systematically excluded, on extended IHC were undifferentiated, neuroendocrine and basaloid carcinomas (cytokeratin, CK5/6, chromogranin, synaptophysin, negative); melanoma (S-100, HMB45 negative); rhabdomyosarcoma (desmin, myogenin negative); myeloid sarcoma (LCA, CD117, CD34 negative), anaplastic large cell lymphoma (LCA, CD3 negative).

This preceding extensive immune-histochemical investigation built upon a cogent index of differentials, correlated with clinic-radiologic and biochemical inputs - was able to provide us with a precise diagnosis, of rare yet potentially treatable malignancy, at this site-successfully managed by local radiation therapy alone. [4],[5]


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